msm: camera: Send frame information to user space

For each frame generated from the hardware, there may be associated
information like error notification, timestamp etc. Add a mechanism
in the kernel to send such information to user space via the V4L2
event framework of the request manager device.

This information will be consumed by user space to process the frames
correctly and recover from errors, if any.

CRs-Fixed: 2048149
Change-Id: I1b726c2fd5dd3f845eba47eca30977f8cabd7fda
Signed-off-by: Seemanta Dutta <seemanta@codeaurora.org>