Subject: msm: camera: Add support for multiple SOF events.

Multiple SOF events are required, when running multiple HW streams on
a single VFE, and the user space needs to distinguish between
different SOFs in the different streams.  Such situation can occur,
when we have one or more RDI streams in parallel with a PIX stream.

Change-Id: Id4d03ca8d65d60ccbbb8949311a31607eb7417fe
Signed-off-by: Vladislav Hristov <vhrist@codeaurora.org>