dt-bindings: gpu: mali-utgard: Add xlnx,zynqmp-mali compatible

Xilinx zynqmp SoC contains Mali400, so add its specific compatible to
bindings.

Signed-off-by: Parth Gajjar <parth.gajjar@amd.com>
Signed-off-by: Vishal Sagar <vishal.sagar@amd.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230321070619.29440-2-parth.gajjar@amd.com


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