mac80211: remove unused macros

Various macros in mac80211 aren't used, remove them. In one
case it's used under ifdef, so ifdef it for the W=2 warning.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220202104617.5172d7fd878e.I2f1fce686a2b71003f083b2566fb09cf16b8165a@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>