[platform-celestica] Add HLX a DPS200 PSU driver.

[pphuchar]

- What I did
Implement Delta DPS200 PSU driver for Haliburton.

- How I did it
Add the driver in hlx platform module package. And register psu pmbus devices in platform init script.

- How to verify it
After boot run sensors dps200-* to show PSU sensors information.
The output should be like this:

admin@sonic:~$ sensors dps200-*
dps200-i2c-13-5b
Adapter: i2c-8-mux (chan_id 3)
vin:         +231.50 V  (crit min = +75.00 V, min = +80.00 V)
vout1:       +11.90 V  
fan1:        8480 RPM
temp1:        +36.0 C  (high = +85.0 C, crit = +90.0 C)
temp2:        +34.0 C  (high = +85.0 C, crit = +90.0 C)
temp3:        +34.0 C  (high = +85.0 C, crit = +90.0 C)
pin:          40.00 W  (max = 312.00 W)
pout1:        36.50 W  (max = 216.00 W, crit = 240.00 W)
iin:          +0.23 A  (max =  +1.80 A)
iout1:        +3.10 A  (max = +18.00 A, crit max = +20.00 A)

dps200-i2c-12-5a
Adapter: i2c-8-mux (chan_id 2)
vin:         +232.50 V  (crit min = +75.00 V, min = +80.00 V)
vout1:       +11.90 V  
fan1:        8192 RPM
temp1:        +39.0 C  (high = +85.0 C, crit = +90.0 C)
temp2:        +35.0 C  (high = +85.0 C, crit = +90.0 C)
temp3:        +35.0 C  (high = +85.0 C, crit = +90.0 C)
pin:          12.50 W  (max = 312.00 W)
pout1:        16.50 W  (max = 216.00 W, crit = 240.00 W)
iin:          +0.13 A  (max =  +1.80 A)
iout1:        +1.40 A  (max = +18.00 A, crit max = +20.00 A)

- Description for the changelog

• Add Delta DPS200 PSU driver to Haliburton.

- A picture of a cute animal (not mandatory but encouraged)