iwlwifi: keep plcp_delta_threshold in priv

The base_params shouldn't be writable, so keep
a copy of this in priv that can be modified.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 73acbab..0c397fd 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -770,6 +770,8 @@
 	struct iwl_channel_info *channel_info;	/* channel info array */
 	u8 channel_count;	/* # of channels */
 
+	u8 plcp_delta_threshold;
+
 	/* thermal calibration */
 	s32 temperature;	/* Celsius */
 	s32 last_temperature;