ath9k: remove mode specific default noise floor values

The NOISE_FLOOR array we have is mode specific, and the only
possible indexed values are A, B and G. The mode routine only
can return G or A, so this is band specific. Then since the
values for A and G (5ghz or 2ghz) are the same (-96) we simply
remove the array and use a static value.

If we later determine we want to use special values for
HT configurations we can use the new mac80211 conf_is_ht*()
helpers.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath9k/calib.c

@@ -19,8 +19,6 @@
 #include "reg.h"
 #include "phy.h"
 
-static const int16_t NOISE_FLOOR[] = { -96, -93, -98, -96, -93, -96 };
-
 /* We can tune this as we go by monitoring really low values */
 #define ATH9K_NF_TOO_LOW	-60
 
@@ -740,10 +738,9 @@ s16 ath9k_hw_getchan_noise(struct ath_hal *ah, struct ath9k_channel *chan)
 			chan->channel, chan->channelFlags);
 		return ATH_DEFAULT_NOISE_FLOOR;
 	}
-	if (ichan->rawNoiseFloor == 0) {
-		enum wireless_mode mode = ath9k_hw_chan2wmode(ah, chan);
-		nf = NOISE_FLOOR[mode];
-	} else
+	if (ichan->rawNoiseFloor == 0)
+		nf = -96;
+	else
 		nf = ichan->rawNoiseFloor;
 
 	if (!ath9k_hw_nf_in_range(ah, nf))