iio: adc: ad9361: use gpiod_set_value_cansleep() when resetting chip

This appears when using some GPIO drivers that enable `can_sleep` to true.
This (`can_sleep`) seems to be a debugging facility, that is also enabled by
the PCA953x driver (used for the SidekiqZ2 GPIO expanders).

Even though `can_sleep` is true, the kernel must still compile the `DEBUG`
macro to actually call more debug code, so in essence the cansleep()
variants are only useful when compiling the code for debugging.

The warning is more harmless (as it seems), and it's a lot of dmesg log-spam.

Kernel warnings look like this:
```
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/gpio/gpiolib.c:2626 gpiod_set_value+0x70/0xa8
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-04227-g8a37c19debc4 #3
Hardware name: Xilinx Zynq Platform
[<c0015a28>] (unwind_backtrace) from [<c0012730>] (show_stack+0x10/0x14)
[<c0012730>] (show_stack) from [<c017d2dc>] (dump_stack+0x80/0xa0)
[<c017d2dc>] (dump_stack) from [<c0022190>] (__warn+0xcc/0xfc)
[<c0022190>] (__warn) from [<c0022264>] (warn_slowpath_null+0x1c/0x24)
[<c0022264>] (warn_slowpath_null) from [<c01a2344>] (gpiod_set_value+0x70/0xa8)
[<c01a2344>] (gpiod_set_value) from [<c0365f0c>] (ad9361_reset+0x28/0xa0)
[<c0365f0c>] (ad9361_reset) from [<c036b13c>] (ad9361_probe+0x1a64/0x21cc)
[<c036b13c>] (ad9361_probe) from [<c02214f0>] (spi_drv_probe+0x84/0xa0)
[<c02214f0>] (spi_drv_probe) from [<c01df2e4>] (driver_probe_device+0x12c/0x294)
[<c01df2e4>] (driver_probe_device) from [<c01df4cc>] (__driver_attach+0x80/0xa4)
[<c01df4cc>] (__driver_attach) from [<c01dda7c>] (bus_for_each_dev+0x6c/0x90)
[<c01dda7c>] (bus_for_each_dev) from [<c01dea14>] (bus_add_driver+0xc8/0x1e4)
[<c01dea14>] (bus_add_driver) from [<c01dfcdc>] (driver_register+0x9c/0xe0)
[<c01dfcdc>] (driver_register) from [<c00097fc>] (do_one_initcall+0xac/0x150)
[<c00097fc>] (do_one_initcall) from [<c05e2d5c>] (kernel_init_freeable+0x120/0x1e8)
[<c05e2d5c>] (kernel_init_freeable) from [<c04796e8>] (kernel_init+0x8/0xf4)
[<c04796e8>] (kernel_init) from [<c000ef78>] (ret_from_fork+0x14/0x3c)
---[ end trace 0bb33d2be832b243 ]---
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/gpio/gpiolib.c:2626 gpiod_set_value+0x70/0xa8
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W       4.9.0-04227-g8a37c19debc4 #3
Hardware name: Xilinx Zynq Platform
[<c0015a28>] (unwind_backtrace) from [<c0012730>] (show_stack+0x10/0x14)
[<c0012730>] (show_stack) from [<c017d2dc>] (dump_stack+0x80/0xa0)
[<c017d2dc>] (dump_stack) from [<c0022190>] (__warn+0xcc/0xfc)
[<c0022190>] (__warn) from [<c0022264>] (warn_slowpath_null+0x1c/0x24)
[<c0022264>] (warn_slowpath_null) from [<c01a2344>] (gpiod_set_value+0x70/0xa8)
[<c01a2344>] (gpiod_set_value) from [<c0365f28>] (ad9361_reset+0x44/0xa0)
[<c0365f28>] (ad9361_reset) from [<c036b13c>] (ad9361_probe+0x1a64/0x21cc)
[<c036b13c>] (ad9361_probe) from [<c02214f0>] (spi_drv_probe+0x84/0xa0)
[<c02214f0>] (spi_drv_probe) from [<c01df2e4>] (driver_probe_device+0x12c/0x294)
[<c01df2e4>] (driver_probe_device) from [<c01df4cc>] (__driver_attach+0x80/0xa4)
[<c01df4cc>] (__driver_attach) from [<c01dda7c>] (bus_for_each_dev+0x6c/0x90)
[<c01dda7c>] (bus_for_each_dev) from [<c01dea14>] (bus_add_driver+0xc8/0x1e4)
[<c01dea14>] (bus_add_driver) from [<c01dfcdc>] (driver_register+0x9c/0xe0)
[<c01dfcdc>] (driver_register) from [<c00097fc>] (do_one_initcall+0xac/0x150)
[<c00097fc>] (do_one_initcall) from [<c05e2d5c>] (kernel_init_freeable+0x120/0x1e8)
[<c05e2d5c>] (kernel_init_freeable) from [<c04796e8>] (kernel_init+0x8/0xf4)
[<c04796e8>] (kernel_init) from [<c000ef78>] (ret_from_fork+0x14/0x3c)
---[ end trace 0bb33d2be832b244 ]---
```

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Author: commodo

drivers/iio/adc/ad9361.c

@@ -934,9 +934,9 @@ static int ad9361_1rx1tx_channel_map(struct ad9361_rf_phy *phy, bool tx, int cha
 static int ad9361_reset(struct ad9361_rf_phy *phy)
 {
 	if (phy->pdata->reset_gpio) {
-		gpiod_set_value(phy->pdata->reset_gpio, 0);
+		gpiod_set_value_cansleep(phy->pdata->reset_gpio, 0);
 		mdelay(1);
-		gpiod_set_value(phy->pdata->reset_gpio, 1);
+		gpiod_set_value_cansleep(phy->pdata->reset_gpio, 1);
 		mdelay(1);
 		dev_dbg(&phy->spi->dev, "%s: by GPIO", __func__);
 		return 0;