arm64: dts: ti: k3-am65-mcu: add cpsw cpts node

Add DT node for the TI AM65x SoC Common Platform Time Sync (CPTS).

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