Add the required nodes to enable ICSSG SR2.0 based prueth networking.

As the driver still needs to be extended for SR1.0 support, keep related
nodes disabled on PG1 devices.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://lore.kernel.org/r/565d31a5fd29c4dd0cf28e347049a1247a6e446c.1699087938.git.jan.kiszka@siemens.comSigned-off-by: Nishanth Menon <nm@ti.com>