msm: vidc: Add error handling for session init failure

When driver tries to open more instances than FW
supports, FW returns session_init failure. This
failure needs to be handled properly by the driver.

CRs-Fixed: 487665
Change-Id: If15d00d046a0b8b8a41c1d2941e53a742ab7ef0f
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>