msm: vidc: Add port information to flush_done event

When video driver queues the flush event, it doesn't convey the
port which is flushed. Due to this userspace content has to
handle the event according to the flush status variables that it
maintains. This handling can go wrong when there are concurrent
flush commands from client. Address this by adding port detail
to flush event.

Change-Id: Ie9b7e35ad396ba8eed20dcca1f655b3e23f6626c
Signed-off-by: Abdulla Anam <abdullahanam@codeaurora.org>