b43: N-PHY: put radio-specific code in separated file

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/phy_n.c b/drivers/net/wireless/b43/phy_n.c
index dd9cfe5..284b54f 100644
--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -29,6 +29,7 @@
 #include "b43.h"
 #include "phy_n.h"
 #include "tables_nphy.h"
+#include "radio_2055.h"
 #include "main.h"
 
 struct nphy_txgains {