arm64: zynqmp: Rename dma to dma-controller

The ZynqMP dma engines are actually dma-controllers as specified by the
device tree binding. Rename the device tree nodes accordingly.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Link: https://lore.kernel.org/r/20220112151541.1328732-4-m.tretter@pengutronix.de


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