ARM: dts: aspeed: Add AST2600 I3C control pins

Add pinctrl support for the I3C1 and I3C2 pins.

Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Link: https://lore.kernel.org/r/20230809134413.3614535-1-dylan_hung@aspeedtech.com


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