msm: vidc: kill unsupported sessions

Unsupported sessions are not being killed when hardware
overload error occurs, so these sessions are not closed
inside video hardware resulting in max clients error
from video hardware for the following supported sessions.
Hence driver need to kill the unsupported sessions to
avoid max clients error for the supported sessions.

b/24065713

Change-Id: I37a839a59db3ec1a0e526730475fbe8b935ccede
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>