add generic ieee80211_encrypt() and ieee80211_decrypt() functions that

can handle multiple ciphers (the key to use is determined automatically
by these functions based on the frame's destination address).
add ieee80211_ccmp_encrypt() and ieee80211_ccmp_decrypt().
those two functions only do encapsulation/decapsulation of CCMP frames
for now (they don't do SW crypto). they will help to test things with
drivers that can do HW crypto.
add a ni_pairwise_key field to struct ieee80211_node to actually install
the pairwise transient key.
install the GTK in ic_nw_keys[].

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