usb: gadget: multi: Remove unused include

cleanup only, no functional changes.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/multi.c

@@ -45,7 +45,6 @@ MODULE_LICENSE("GPL");
 
 #define USBF_ECM_INCLUDED
 #include "f_ecm.c"
-#include "f_subset.c"
 #ifdef USB_ETH_RNDIS
 #  include "f_rndis.c"
 #  include "rndis.h"