drm: xlnx: hdmi: Add FRL interrupt handler

commit  457fc055f8f5ae339da1bb5e044b8d2043db89e1 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.10

This patch adds FRL interrupt handler

Signed-off-by: Venkateshwar Rao Gannavarapu <venkateshwar.rao.gannavarapu@xilinx.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>