ath79: harmonize ethernet-phy naming scheme

A minority of ethernet-phy definitions seems to use numbers in label,
name and reg property relatively random. This patch aligns their
use to have the same numeric value for all of them.

While at it, improve order of properties/add newlines for the ethX
nodes where necessary.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>