arm64: dts: ti: k3-j721e-mcu: add mcu cpsw cpts node

Add DT node for The TI J721E MCU CPSW CPTS which is part of MCU CPSW NUSS.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>