arm64: dts: sparx5: Add pinctrl support

This add pinctrl support to the Microchip Sparx5 SoC.

Link: https://lore.kernel.org/r/20200615133242.24911-5-lars.povlsen@microchip.com


Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>