msm: vidc: Add log to indicate image session

During multiple error scenario, video driver prints
the properties of ongoing video instances.
Add a log to indicate if the session is of type
image.

Change-Id: Ie23522bd31c9f5188c204c4a1eeae59a627d1976
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>