lib80211: don't use skcipher

Using skcipher just makes the code longer, and mac80211
also "open-codes" the WEP encrypt/decrypt.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Git-Commit: b802a5d6f345d207a5dd120149f6d2fdff2e4fcc
Git-Repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Change-Id: Ic0dedbad06763a2dbd727d8f82105e4099c4a95d
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>