ath9k: add a debugfs entry for ignoring CCA on the extension channel in HT40

Debugfs requires a u32 for bool knobs though so we turn the
ath9k_hw knob into a u32 as well.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index ba84ac7..20ec29f 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -238,7 +238,7 @@
 	int sw_beacon_response_time;
 	int additional_swba_backoff;
 	int ack_6mb;
-	int cwm_ignore_extcca;
+	u32 cwm_ignore_extcca;
 	u8 pcie_powersave_enable;
 	u8 pcie_clock_req;
 	u32 pcie_waen;