arm64: dts: k3-am654-base-board: add mcu cpsw nuss pinmux and phy defs

Add mcu cpsw nuss pinmux and phy defs required by cpsw.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>