usb: gadget: include <linux/prefetch.h> to fix compiling error
drivers/usb/gadget/at91_udc.c: In function 'write_fifo':
drivers/usb/gadget/at91_udc.c:421:2: error: implicit declaration of function 'prefetch'
make[3]: *** [drivers/usb/gadget/at91_udc.o] Error 1
make[2]: *** [drivers/usb/gadget] Error 2
make[2]: *** Waiting for unfinished jobs....
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index 6e42aab..95e8138 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -60,6 +60,7 @@
#include <linux/device.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/prefetch.h>
#include <asm/byteorder.h>
#include <asm/system.h>