mac80211: radiotap: Use BIT() instead of shifts

IEEE80211_RADIOTAP_EXT has a value of 31, which means if shift was ever
cast to 64-bit, the result would become sign-extended. As a matter of
robustness, just replace all the open-coded shifts with BIT().

Suggested-by: David Sterba <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/
Cc: Johannes Berg <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Johannes Berg <[email protected]>

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