ath: Add a missing world regulatory domain 0x6C

Some customers use 0x6C world regulatory domain and this patch
adds the support.

Cc: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/regd.c b/drivers/net/wireless/ath/regd.c
index f828f29..7e3b290 100644
--- a/drivers/net/wireless/ath/regd.c
+++ b/drivers/net/wireless/ath/regd.c
@@ -97,8 +97,8 @@
 	}
 };
 
-/* Can be used by 0x67, 0x6A and 0x68 */
-static const struct ieee80211_regdomain ath_world_regdom_67_68_6A = {
+/* Can be used by 0x67, 0x68, 0x6A and 0x6C */
+static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
 	.n_reg_rules = 4,
 	.alpha2 =  "99",
 	.reg_rules = {
@@ -151,7 +151,8 @@
 	case 0x67:
 	case 0x68:
 	case 0x6A:
-		return &ath_world_regdom_67_68_6A;
+	case 0x6C:
+		return &ath_world_regdom_67_68_6A_6C;
 	default:
 		WARN_ON(1);
 		return ath_default_world_regdomain();