The R6220 and WNDR3700v5 are identical apart from using NAND/NOR flash and
having a different casing. This adds a new cleaned up R6220.dtsi with the
common bits for both devices. Both devices now have feature parity.
Performed cleanup:
* generic DTS node names
* regulator for usb power
* added missing pinctrl groups
* use switch port instead of VLAN as trigger for WAN LED
Fixes for WNDR3700v5:
* all LEDS work
* correct ethernet MAC addresses
Signed-off-by: Jan Hoffmann <jan@3e8.eu>
