ARM: dts: AM33XX: Add CPSW phy_id device tree data to am335x-evmsk

Add phy_id device tree data to am335x-evmsk device to bring up CPSW
ethernet present on am335x starter kit.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>