msm: vidc: Fix lock issue in streamon failure

queued_list lock is acquired before calling vb2_stream so
don't acquire the lock within vb2_streamon function if
driver streamon call failed.

CRs-Fixed: 2064048
Change-Id: I8266def07d3056969943f209c63f638ea94de519
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>