d80211.h bitfield removal

Continue d80211 bitfield removal. In general, compilers have difficulty generating efficient code for bitfields. This patchset removes all bitfields from include/net/d80211.h (except for the xr and Super A/G fields which are completely removed by previous patches).

I converted the 1 bit bitfields into a bit in a u32 flags structure member. Larger bitfields I converted into their u8/u16/whatever equivalent.

This should be a no-op from a functionality standpoint.

-David

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