msm: cpp: Fix green frames during batch mode for NV12 formats

The meta data offsets is not set to zero causing invalid buffers
being send out from cpp causing green frames in video during
batch mode for NV12 formats. If format is not ubwc, reset meta
data offset to zero in the set buffer group payload.

CRs-Fixed: 952085
Change-Id: I912b28d9ed7f02e5e87513d92d088adcbebe1d1b
Signed-off-by: Krishnankutty Kolathappilly <kkolatha@codeaurora.org>