ath9k_hw: Cleanup TX power calculation for AR9287

* Add a few comments, and move the updation of max_power_level
  to a helper routine. This is also done by non-4K based chipsets,
  this will be fixed in a separate patch.

* Remove two WARs which are required for old AR5416 chipsets,
  and are not needed for AR9287.

* Fix indentation and make things readable.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/eeprom.h b/drivers/net/wireless/ath/ath9k/eeprom.h
index 14186f2..7da7d73 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom.h
+++ b/drivers/net/wireless/ath/ath9k/eeprom.h
@@ -705,6 +705,7 @@
 				u16 numRates, bool isHt40Target);
 u16 ath9k_hw_get_max_edge_power(u16 freq, struct cal_ctl_edges *pRdEdgesPower,
 				bool is2GHz, int num_band_edges);
+void ath9k_hw_update_regulatory_maxpower(struct ath_hw *ah);
 int ath9k_hw_eeprom_init(struct ath_hw *ah);
 
 #define ar5416_get_ntxchains(_txchainmask)			\