drm: xlnx: sdi: YUV444 format support

commit 1ddfd59678d95a6a364757d385bb2dbc85021888 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.15

This patch handles the addition of new drm property sdi_444_out to support
YUV444 format.

Signed-off-by: Ramanjaneyulu Uppari <ramanjaneyulu.uppari@amd.com>
Reviewed-by: Vishal Sagar <vishal.sagar@amd.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>