camera: some compability

Change-Id: I5e312d2bbb1fe45b551a514ef1d08937eefe8c66
[WIP] V4L2 camera implement

Change-Id: I811a3c9fbd0adb0951085b4aff131a403bdd925b
adjust msm_cam_vreg

Change-Id: Ia7b5f7273208cc241b7974d5a7c194c90d68dbd5