Apart from the embedded BCM6362 wireless, Netgear DGND3700v2 has external
BCM43228 wireless connected by PCIe.
Fallback SPROM isn't needed for this one because it has a physical SPROM.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
BMIPS is a generic arch that can be used for multiple Broadcom SoCs, each one
with its own specific drivers, so instead of having a huge kernel supporting
all of them, let's switch to a subtarget per SoC like other OpenWrt targets.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>