arm64: zynqmp: Reorder parameters for zynqmp_mmio_write()

Parameter order is not correct based on zynqmp_mmio_write() declaration.

Fixes: be52372f ("arm64: zynqmp: Use zynqmp_mmio_read/write functions")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>