ramips: rt305x: use flash location for wan_mac in 02_network

This uses the flash locations instead of eth0 MAC address to
calculate MAC address increments for WAN.

The change will make the MAC address setup of a particular device
more obvious and removes the dependency of 02_network on the eth0
initialization.

This removes the wan_mac setup for the following devices as they
do not set up a MAC address for ethernet in the first place:
- asiarf,awapn2403
- belkin,f7c027
- dlink,dir-615-d
- mofinetwork,mofi3500-3gn
- prolink,pwh2004
- ralink,v22rw-2x2
- unbranded,wr512-3gn-4m
- unbranded,wr512-3gn-8m

While at it, make some DT node labels consistent with the label
property.

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

target/linux/ramips/dts/rt3050_dlink_dir-300-b1.dts

@@ -39,7 +39,7 @@
 				read-only;
 			};
 
-			factory: partition@40000 {
+			partition@40000 {
 				label = "devconf";
 				reg = <0x40000 0x10000>;
 				read-only;

target/linux/ramips/dts/rt5350_7links_px-4885-4m.dts

@@ -32,7 +32,7 @@
 				read-only;
 			};
 
-			factory: partition@40000 {
+			devconf: partition@40000 {
 				label = "devconf";
 				reg = <0x40000 0x10000>;
 				read-only;

target/linux/ramips/dts/rt5350_7links_px-4885-8m.dts

@@ -32,7 +32,7 @@
 				read-only;
 			};
 
-			factory: partition@40000 {
+			devconf: partition@40000 {
 				label = "devconf";
 				reg = <0x40000 0x10000>;
 				read-only;

target/linux/ramips/dts/rt5350_7links_px-4885.dtsi

@@ -51,7 +51,7 @@
 };
 
 &ethernet {
-	mtd-mac-address = <&factory 0x28>;
+	mtd-mac-address = <&devconf 0x28>;
 };
 
 &esw {
@@ -59,5 +59,5 @@
 };
 
 &wmac {
-	ralink,mtd-eeprom = <&factory 0>;
+	ralink,mtd-eeprom = <&devconf 0>;
 };