mm-video-v4l2: vdec: Fix issue with dynamic buffer mode disablement

Video driver always operates in dynamic buffer mode for decoder
output. Disable meta buffer mode even if driver fails to move to
static buffer mode.

Test: make vts -j123 && vts-tradefed run commandAndExit vts \
--skip-all-system-status-check \
--skip-preconditions -m VtsHalMediaOmxV1_0Host \
-l INFO

Bug: 66804380
Change-Id: I9cfce1d812ee04120a127fd852cdc229fa30da25