ath9k: Revamp wireless mode usage

Use a single enum for managing modes, store supported modes by
the HW in a bitmask.
Register legacy rates with mac80211 only at init.

Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/regd.h b/drivers/net/wireless/ath9k/regd.h
index ae77496..0ecd344 100644
--- a/drivers/net/wireless/ath9k/regd.h
+++ b/drivers/net/wireless/ath9k/regd.h
@@ -117,11 +117,11 @@
 #define isUNII1OddChan(ch) \
 	((ch == 5170) || (ch == 5190) || (ch == 5210) || (ch == 5230))
 
-#define IS_HT40_MODE(_mode)      \
-	(((_mode == ATH9K_MODE_SEL_11NA_HT40PLUS  || \
-	_mode == ATH9K_MODE_SEL_11NG_HT40PLUS    || \
-	_mode == ATH9K_MODE_SEL_11NA_HT40MINUS   || \
-	_mode == ATH9K_MODE_SEL_11NG_HT40MINUS) ? true : false))
+#define IS_HT40_MODE(_mode)					\
+	(((_mode == ATH9K_MODE_11NA_HT40PLUS  ||		\
+	   _mode == ATH9K_MODE_11NG_HT40PLUS    ||		\
+	   _mode == ATH9K_MODE_11NA_HT40MINUS   ||		\
+	   _mode == ATH9K_MODE_11NG_HT40MINUS) ? true : false))
 
 #define CHAN_FLAGS      (CHANNEL_ALL|CHANNEL_HALF|CHANNEL_QUARTER)