Sensors: Add proximity calibration for APDS9930

Add proximity calibration code. It will be used when calibrating
the proximity

Change-Id: I5dcb353dafb2d891c32b862b28e818eb8876db5c
Signed-off-by: kangsik.shin <kangsik.shin@lge.com>
Signed-off-by: Devin Kim <dojip.kim@lge.com>
Git-commit: 6d2f86ad386ba709ce3c5dcad49392bc09a23a6e
Git-repo: https://android.googlesource.com/kernel/msm.git


[mengmeng@codeaurora.org: cherry picked from mirrored branch]
Signed-off-by: Oliver Wang <mengmeng@codeaurora.org>