msm: camera: common: Enable flash operation at EOF

Flash operation is currently being done at EPOCH timeframe. In order
to support flash operation at EPOCH extra frame needs to skip to avoid
partial lit on previous request. Moving flash operation to EOF saves
one frame and also give more stability to perform the operation with
higher stablility with removing partial lit. This change gives flash
hardware extra time to perform the operation for turn on/off the flash
hardware.

CRs-Fixed: 2795719
Change-Id: I08b82527006d8a9c81c5a5be0768705051cbd3f1
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>
Signed-off-by: Depeng Shao <depengs@codeaurora.org>