msm: vidc: Fix VP9 decoder failure due to scaling feature

VP9 decoder does not release the output buffers in port
reconfiguration sequence due to scaling feature. Support
the feature by doing appropriate changes in driver.

Change-Id: I1a5602f15c1206d0f248a5311678201743a494fc
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>