By default both kmod-bcma and kmod-ssb are selected by kmod-b43.
However, only one of both modules is needed for bmips subtargets:
- bcma: bcm6318, bcm6328, bcm6362, bcm63268
- ssb: bcm6358, bcm6368
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>