d80211: remove bitfields from include/net/d80211.h

Continue d80211 bitfield removal. In general, compilers have difficulty generating efficient code for bitfields. This patchset removes all bitfields from include/net/d80211.h.

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.

Changes from take3:

Switch flags structure member to u32 for struct ieee80211_tx_control and struct ieee80211_key_conf.

Refresh to apply to current wireless-dev
- update p54 driver to new API
- update patch based on various changes in bcm43xx and rt2x00 drivers
- account for removal of extra_hdr_room bitfield

Changes from take2:

Refresh to apply to current wireless-dev.

Changes from take1:

Update rt2500usb.c and rt73usb.c drivers based on the new structures.

Changes from take0:

Update the patches to apply on top of the following patches:

d80211: remove unused Super AG definitions, purge comment

    (http://marc.theaimsgroup.com/?l=linux-netdev&m=116102409931269&w=2)
d80211: remove initialization of unused xr structure members
    (http://marc.theaimsgroup.com/?l=linux-netdev&m=116076811809305&w=4)
d80211: remove unused xr structure members, interface, etc.
    (http://marc.theaimsgroup.com/?l=linux-netdev&m=115989929600617&w=4)

For key_conf_bitfields.patch change the new flags member to u8 from u32.

For tx_control_bitfields.patch move the rts_cts_duration and retry_limit members in ieee80211_tx_control to allow for smaller structure size and change the flags member from u32 to u16.

For tx_status_bitfields.patch, in drivers/net/wireless/d80211/bcm43xx/bcm43xx_dma.c and drivers/net/wireless/d80211/bcm43xx/bcm43xx_pio.c note that ieee80211_tx_status is already zero'd, so the ack bit only needs to be set, not cleared.

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