cfg80211: add cipher capabilities

This adds the necessary code and fields to let drivers specify
their cipher capabilities and exports them to userspace. Also
update mac80211 to export the ciphers it has.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 05ba353..c014238 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -453,6 +453,9 @@
  * 	attributes consists of a nested attribute containing
  * 	NL80211_FREQUENCY_ATTR_*
  *
+ * @NL80211_ATTR_CIPHER_SUITES: a set of u32 values indicating the supported
+ *	cipher suites
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -540,6 +543,7 @@
 	NL80211_ATTR_KEY_TYPE,
 
 	NL80211_ATTR_MAX_SCAN_IE_LEN,
+	NL80211_ATTR_CIPHER_SUITES,
 
 	NL80211_ATTR_FREQ_BEFORE,
 	NL80211_ATTR_FREQ_AFTER,