msm: vidc: Add logs to indicate video open/close

Add logs to indicate when video is openend and
when it is closed. This helps a lot in debugging
complex issues where multiple instances of video
are running concurrently.

Change-Id: I043b248a6bf90bd9b328527782b3a406f6b7f577
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>