msm: camera: Fix Greenish Edges in corners for CW & Horizon images

1.Add Black Level Trigger register values to register set.
2.Change Group hold ON/OFF register base address & data.
3.Update correct exposure calculations,especially during exposure
  switch from light to dark.
4.Access of Frame lenght lines is protected under Group Hold ON/OFF

CRs-Fixed: 359509
Change-Id: I8dd748f1b82850e565928bf4ea4c890ebae71d63
Signed-off-by: Lokesh Kumar Aakulu <lkumar@codeaurora.org>