iwlwifi: mvm: split constants into separate file

To make maintaining some constant default values in the
driver easier, declare them in a separate file.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index 879fb01..8891c81 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -76,6 +76,7 @@
 #include "iwl-trans.h"
 #include "sta.h"
 #include "fw-api.h"
+#include "constants.h"
 
 #define IWL_INVALID_MAC80211_QUEUE	0xff
 #define IWL_MVM_MAX_ADDRESSES		5