Revert "fix msm_fb.c"

This reverts commit f3b5b012ab4a20ebf0de6ab7b26728f653022b1a.
Revert "Revert "video: msm_fb: Ensure backlight is scaled atomically""

This reverts commit 6398738a973226b53c1e7c7f46b419684886df7b.
jenad: update defconfig