[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>

drivers/usb/serial/cypress_m8.c

@@ -59,11 +59,11 @@
 #include <linux/moduleparam.h>
 #include <linux/spinlock.h>
 #include <linux/usb.h>
+#include <linux/usb/serial.h>
 #include <linux/serial.h>
 #include <linux/delay.h>
 #include <asm/uaccess.h>
 
-#include "usb-serial.h"
 #include "cypress_m8.h"