iwlwifi: convert new uses of __attribute__ ((packed)) to __packed

Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-commands.h

@@ -1245,7 +1245,7 @@ struct iwl_txfifo_flush_cmd {
 	__le32 fifo_control;
 	__le16 flush_control;
 	__le16 reserved;
-} __attribute__ ((packed));
+} __packed;
 
 /*
  * REPLY_WEP_KEY = 0x20
@@ -3547,7 +3547,7 @@ struct iwl_sensitivity_cmd {
 struct iwl_enhance_sensitivity_cmd {
 	__le16 control;			/* always use "1" */
 	__le16 enhance_table[ENHANCE_HD_TABLE_SIZE];	/* use HD_* as index */
-} __attribute__ ((packed));
+} __packed;
 
 
 /**