Apart from the embedded BCM63268 wireless, this device has an external BCM4360
connected by PCIe which needs a fallback SPROM.
b43 isn't enabled for this device because BCM4360 isn't supported (AC PHY).
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>