msm: vidc: disable decode batching feature

This feature implemented for power optimization
with OMX but not well compliant with Codec 2.0.
Disable it to unblock VT frame drop issue.

Bug: 149071324
Test: VT frame rate test
Change-Id: I187958f4da10d5936c0f0fbd5060301e55ac7f29
Signed-off-by: Wen Chang Liu <wenchangliu@google.com>