regulator: cpr2-gfx-regulator: Add snapshot of cpr2-gfx-regulator driver

Snapshot of cpr2-gfx-regulator driver from msm-3.10
kernel (commit: e2aa056fff2ced6876f277d0fc4fabd47c43949f). Fixed
checkpatch warnings by replacing kmalloc by kcalloc for array
allocations and removed the error messages for memory allocation failures.

Change-Id: I5ff29c375559f490f12c9863e27f8a17d7872149
Signed-off-by: Ravindranath Thiyagarajan <rthiyaga@codeaurora.org>