msm: vidc: Don't report unsupported bitstreams as hardware errors

Usually clients don't really care what sort of error they get since the
error handling tends to be the same.  But for clients that do, report it
properly.

Change-Id: I8dd453b29fa937529091d48fc1f57963e1a77650
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>