arm64: dts: ti: k3-am62-mcu: Enable MCU GPIO module

AM62 has x1 GPIO module and associated interrupt router in MCU Domain.
Add DT nodes for the same.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Aswath Govindraju <a-govindraju@ti.com>
Link: https://lore.kernel.org/r/20220421061938.122317-1-vigneshr@ti.com