msm-camera: Add placeholders for 3A features in YUV sensor for 8916

Adding support for 3A feature in PORed YUV sensor for 8916.Features will
not be functional because we are just adding placeholders for now.

CRs-Fixed: 647204
Change-Id: I5bc64730f525fad276ed6f4f2cb3a1c638c22131
Signed-off-by: Vivek Veenam <vveenam@codeaurora.org>