USB: move <linux/usb_gadget.h> to <linux/usb/gadget.h>

Move <linux/usb_gadget.h> to <linux/usb/gadget.h>, reducing
some of the clutter in the main include directory.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/usb_gadget.h b/include/linux/usb/gadget.h
similarity index 99%
rename from include/linux/usb_gadget.h
rename to include/linux/usb/gadget.h
index 5ea611e..46705e9 100644
--- a/include/linux/usb_gadget.h
+++ b/include/linux/usb/gadget.h
@@ -1,5 +1,5 @@
 /*
- * <linux/usb_gadget.h>
+ * <linux/usb/gadget.h>
  *
  * We call the USB code inside a Linux-based peripheral device a "gadget"
  * driver, except for the hardware-specific bus glue.  One USB host can