arm64: dts: ti: k3-am642-tqma64xxl-mbax4xxl: add PRU Ethernet support

Add PRU Ethernet controller and PHY nodes, as it was previously done for
the AM64x EVM Device Trees.

Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/20240807121922.3180213-1-matthias.schiffer@ew.tq-group.com


Signed-off-by: Nishanth Menon <nm@ti.com>