Sets openwrt,netdev-name for the gmac1 node in the dts of BPI-R3, which
corresponds to the sfp1 slot, to have a proper naming and match the
label on the official BPI-R3 metal case. This renames the port from eth1
to sfp1.
The COMPAT_VERSION is increased to denote that configuration has to be
adjusted manually.
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>