iwlagn: more comments for bt channel inhibition

Add comments for better description

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 6cfd236..57839ca 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -610,7 +610,7 @@
 	.bt_coex_active = true,
 	.no_sleep_autoadjust = true,
 	.power_level = IWL_POWER_INDEX_1,
-	.bt_ch_announce = 1,
+	.bt_ch_announce = true,
 	.wanted_ucode_alternative = 1,
 	.auto_agg = true,
 	/* the rest are 0 by default */