msm: camera: uapi: Adds UBWC blob payload structure

This change adds UBWC blob payload structure to enable userspace
control over UWBC configuration. This will allow userspace payload
and corresponding API to configure UBWC to remain consistent across
different UBWC versions.

Change-Id: I6f31d7ff9186666703277eb82aefaa8fb48f80e8
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>