TI: Add initial support for TI SK-AM68 board

Add board config for TI SK-AM68 board of K3 Family

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>

Author: 3V3RYONE

config/boards/sk-am68.conf

@@ -0,0 +1,15 @@
+# TI SK-AM68 dual core 16GB 8TOPS GBE USB3 OSPI DisplayPort HDMI
+
+BOARD_NAME="SK-AM68"
+BOARDFAMILY="k3"
+BOARD_MAINTAINER="3V3RYONE"
+BOOTCONFIG="j721s2_evm_a72_defconfig"
+BOOTFS_TYPE="fat"
+BOOT_FDT_FILE="ti/k3-am68-sk-base-board.dts"
+TIBOOT3_BOOTCONFIG="j721s2_evm_r5_defconfig"
+TIBOOT3_FILE="tiboot3-j721s2-hs-fs-evm.bin"
+DEFAULT_CONSOLE="serial"
+KERNEL_TARGET="current,edge"
+SERIALCON="ttyS2"
+ATF_BOARD="generic"
+ATF_K3_USART_OFFSET="K3_USART=0x8"