arm64: dts: imx8mq: Add QuadSPI controller

Add a node for the Freescale/NXP QuadSPI controller and extend the AIPS3
memory range to accommodate the QuadSPI-memory region.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>