ARM: dts: aspeed: Add USB2.0 device controller node

Add USB2.0 device controller(udc) node to device tree
for AST2600.

Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
Link: https://lore.kernel.org/r/20220518062043.1075360-3-neal_liu@aspeedtech.com


Signed-off-by: Joel Stanley <joel@jms.id.au>