arm64: zynqmp: Sync node name address with reg (mailbox)

Address in node name should match with the first reg property in DT.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/5d8e80383912b8ff75409764efb75f3b85917087.1683034376.git.michal.simek@amd.com