arm64: dts: ti: k3-j784s4-evm: Enable MCU CPSW2G

Add device tree support to enable MCU CPSW with J784S4 EVM.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20230315042548.1500528-1-s-vadapalli@ti.com


Signed-off-by: Nishanth Menon <nm@ti.com>