msm: vidc: Communicate session error to client if aborted.

msm_comm_kill_session is called in driver only in situations where
the driver state goes bad. session_abort is called on firmware
which may be honored. But still the session_error needs to be
communicated to the client or else client will operate oblivious
about the bad video driver state.

Change-Id: Iafb90cde31a985bf5377fdcdd1a9653a965c5600
Signed-off-by: Abdulla Anam <abdullahanam@codeaurora.org>