msm: vidc: Handle max clients error properly

When FW returned max clients error, driver is changing inst->state
to INVALID. With this driver doesn't know if FW had valid session or
not to send ABORT command. If driver sends ABORT command, FW times out
because there is no session in FW. Hence clean the session in HFI when
FW returns max clients error so that ABORT doesn't reach FW.

Change-Id: I3543e2fb184b5cf747772b3b4cf7c84b6ef2a794
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>