video: Add skeleton driver for ZynqMP Display port driver

The reason for this driver is to use call power management driver to enable
it in PMUFW. There is missing functionality now but should be added in
near future.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/598cb9515bbabc803f72e287464e3d107cd106a3.1645627920.git.michal.simek@xilinx.com