mmi : Add Motorola MMI Board support [2/?]

Overlay from KXB20.9-1.8-1.4 on LA.BF.1.1.2_rb1.7

WARNING :
- "drivers/media/platform/msm/camera_v2" is a full copy from KXB20.9-1.8-1.4 --> NEED TO BE ADAPTATED (msm_sensors.c especially)
- "drivers/power" has to be REDONE later on.