ARM: dts: keystone-k2g-evm: Enable netcp network driver

Add dt bindings to enable netcp network driver on K2G GP EVM. This
consists of enabling bindings for nss qmss, pktdma, 2u ethss,
mdio, pinmux and netcp devices.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>