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

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

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/47bea10bbc3c88727c1fe839ff20e15a0c79c339.1688992653.git.michal.simek@amd.com