AR9130 WMAC support in -HEAD

[Adrian Chadd]

I've just added the initial AR9130 WMAC support to -HEAD.

This means that interested parties can now build wifi APs using the
AR913x SoC+WMAC such as the TP-LINK WR-1043nd and whatever else uses
it.

Please read the commit message for some pointers as to how to use it
and what the limitations are.

Thanks,


Adrian