iwlwifi: mvm: clean up FIFO definitions

Move all FIFO definitions together into the firmware API
header file and use the same enum/naming scheme for the
command FIFO.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/fw-api.h b/drivers/net/wireless/iwlwifi/mvm/fw-api.h
index 4274f8d..94342db 100644
--- a/drivers/net/wireless/iwlwifi/mvm/fw-api.h
+++ b/drivers/net/wireless/iwlwifi/mvm/fw-api.h
@@ -84,7 +84,14 @@
 	IWL_MVM_CMD_QUEUE = 9,
 };
 
-#define IWL_MVM_CMD_FIFO	7
+enum iwl_mvm_tx_fifo {
+	IWL_MVM_TX_FIFO_BK = 0,
+	IWL_MVM_TX_FIFO_BE,
+	IWL_MVM_TX_FIFO_VI,
+	IWL_MVM_TX_FIFO_VO,
+	IWL_MVM_TX_FIFO_MCAST = 5,
+	IWL_MVM_TX_FIFO_CMD = 7,
+};
 
 #define IWL_MVM_STATION_COUNT	16