arm64: dts: ti: k3-am62a-mcu: Add MCU domain peripherals

Introduce DT nodes for MCU domain SPIs and GPIO modules.

Co-developed-by: Bryan Brattlof <bb@ti.com>
Signed-off-by: Bryan Brattlof <bb@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20230103042110.1092122-2-vigneshr@ti.com