Maybe support 16bit raw of hdsr sensor.

[xusiqin]

origin data of hdr sensor is 24 bit，and after compressing is 16bit or 12bit. After passing to isp, decompressing module is needed, and become to 24bit. Then need LUT module， let raw image become from 24bit to 16bit or 14bit. (14bit is already,16bit is not supported)