iwlwifi: more generic name for bluetooth command

Instead of hardcode 6000 and 2000, use more generic name

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 9ed73e5..296347a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -1918,7 +1918,7 @@
 	__le16 valid;
 };
 
-struct iwl6000_bt_cmd {
+struct iwl_bt_cmd_v1 {
 	struct iwl_basic_bt_cmd basic;
 	u8 prio_boost;
 	/*
@@ -1929,7 +1929,7 @@
 	__le16 rx_prio_boost;	/* SW boost of WiFi rx priority */
 };
 
-struct iwl2000_bt_cmd {
+struct iwl_bt_cmd_v2 {
 	struct iwl_basic_bt_cmd basic;
 	__le32 prio_boost;
 	/*