Revert "staging: rtl8192u: rename CONFIG_IEEE80211_CRYPT_TKIP"

This reverts commit f8cc81f8.

It breaks the build in linux-next.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>