net: zynq_gem: Add new versal compatible string

This patch adds new versal compatible string to GEM driver for Versal
platform.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>