msm: camera: Code cleanup across KMD drivers

Update camera drivers to meet new kernel coding
guidelines.

Change-Id: Ieb842ffd06e0b875de21b6b4f752df48d845277e
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>
Signed-off-by: Vishalsingh Hajeri <vhajeri@codeaurora.org>