mips: dts: realtek: Add address to SoC node name

Although not strictly required by the simple-bus binding, add the bus
offset to the node name to be consistent with other nodes. Also drop the
node label as it is not referenced anywhere.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>