msm: vidc: print session and codec type in dprintk

[1] Maintain log_ctxt cookie to track debug information.
[2] Print codec type and session type by default in logs.

Change-Id: I6c01f3238ba868fdc525f5c60f58545a07bdef3a
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>