ARM: dts: at91: sam9x60: add pincontrol for USB Host

The pincontrol node is needed for USB Host since Linux v5.7-rc1. Without
it the driver probes but VBus is not powered because of wrong pincontrol
configuration.

Fixes: 1e5f532c ("ARM: dts: at91: sam9x60: add device tree for soc and board")
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20201118120019.1257580-2-cristian.birsan@microchip.com