[PATCH] USB: move usb-serial.h to include/linux/usb/

USB serial outside of the kernel tree can not build properly due to
usb-serial.h being buried down in the source tree.  This patch moves the
location of the file to include/linux/usb and fixes up all of the usb
serial drivers to handle the move properly.

Cc: Sergei Organov <osv@javad.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 96e6419..f0530c1 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -65,7 +65,7 @@
 #include <linux/tty_flip.h>
 #include <linux/module.h>
 #include <linux/usb.h>
-#include "usb-serial.h"
+#include <linux/usb/serial.h>
 
 /* Function prototypes */
 static int  option_open(struct usb_serial_port *port, struct file *filp);