arm64: dts: ti: k3-j784s4-evm: Add mcu and wakeup uarts

Add wakeup and MCU uart. This allows the device tree usage in
bootloader and firmwares that can configure the same appropriately.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Link: https://lore.kernel.org/r/20230602214937.2349545-3-nm@ti.com


Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>