drm: xlnx: sdi: HFR feature support

commit 678d9f96e1f53ccafa181578eba545d3b3c8d5a5 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.15

This patch handles HFR data streaming from SDI Tx.
New HFR timing modes have been added for 6G and 12G modes.

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>