headers_check fix: usb/cdc.h

fix the following 'make headers_check' warning:

  usr/include/linux/usb/cdc.h:50: found __[us]{8,16,32,64} type without #include <linux/types.h>
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>

include/linux/usb/cdc.h

@@ -9,6 +9,8 @@
 #ifndef __LINUX_USB_CDC_H
 #define __LINUX_USB_CDC_H
 
+#include <linux/types.h>
+
 #define USB_CDC_SUBCLASS_ACM			0x02
 #define USB_CDC_SUBCLASS_ETHERNET		0x06
 #define USB_CDC_SUBCLASS_WHCM			0x08