mips: dts: ralink: mt7621: move pinctrl and sort its children

mips: dts: ralink: mt7621: move pinctrl and sort its children

Move the pinctrl node prior to the nodes that feature unit
addresses.

Sort pinctrl's child nodes into alphabetical order.

Signed-off-by: Justin Swartz <justin.swartz@risingedge.co.za>
Reviewed-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>