arm64: zynqmp: Add mali-400 gpu node for zynqmp

Add mali-400 gpu node for zynqmp.
Enabled gpu node for xilinx boards.

Signed-off-by: Parth Gajjar <parth.gajjar@amd.com>
Signed-off-by: Vishal Sagar <vishal.sagar@amd.com>
Link: https://lore.kernel.org/r/20230321070619.29440-3-parth.gajjar@amd.com


Signed-off-by: Michal Simek <michal.simek@amd.com>