USB: <linux/usb_ch9.h> becomes <linux/usb/ch9.h>

This moves <linux/usb_ch9.h> to <linux/usb/ch9.h> to reduce some of the
clutter of usb header files.

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

diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index d15bf22..ca8e0eb 100644
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -47,7 +47,7 @@
 #include <asm/uaccess.h>
 #include <asm/unaligned.h>
 
-#include <linux/usb_ch9.h>
+#include <linux/usb/ch9.h>
 #include <linux/usb/cdc.h>
 #include <linux/usb_gadget.h>