[FP4-2196] [FP4]:LCD gamma value is too large

 &&&%%%comment:[FP4]:LCD gamma value is too large
 &&&%%%bug number:FP4-2196
 &&&%%%product name:sm7225_r_fp4
 &&&%%%root cause:coding
 &&&%%%Bug category:T2M
 &&&%%%Module_Impact:kernel
 &&&%%%Test_Suggestion:no
 &&&%%%Solution:revert qualcomm's modification at lcdb regulator
 &&&%%%Test_Report:test is ok
 &&&%%%VAL Can Test:NO

Change-Id: If6e488edfa4b8d11c7e0145255f72761ad15812f