msm: cvp: Add support of new session control commands

CVP session create command allows user mode to set session
attributes before start using the session. CVP session delete
command allows user to shutdown session before close device.

Change-Id: I13ebf82f86733624f46f7bb876befbc7fb8ecc0c
Signed-off-by: George Shen <sqiao@codeaurora.org>