windcharger: mach-gf-windcharger.c doesn't need dev-usb.h

Change-Id: I8d14629dc3c38c79f8111b628ad42ac93622f352
diff --git a/arch/mips/ath79/mach-gf-windcharger.c b/arch/mips/ath79/mach-gf-windcharger.c
index f20d7a1..3ad77f0 100644
--- a/arch/mips/ath79/mach-gf-windcharger.c
+++ b/arch/mips/ath79/mach-gf-windcharger.c
@@ -30,7 +30,6 @@
 #include "dev-eth.h"
 #include "dev-gfmn100.h"
 #include "dev-spi.h"
-#include "dev-usb.h"
 #include "dev-wmac.h"
 #include "machtypes.h"