msm: vidc: Set dpb color format in split buffer mode

Set dpb color format before enabling split buffer mode
to ensure UBWC format is set to video firmware. If not
set proper color format may result in error as video
hardware does not support non-ubwc color formats for
dpb buffers.

CRs-Fixed: 2133529
Change-Id: I8d1f9cf86e6c9501f4aef85876664b0fb90e44ce
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>