usb/ch9: use proper endianess for wBytesPerInterval

while going through Tatyana's changes for the gadget framework I noticed
that this type is not defined as __le16.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index b72f305..0fd3fbd 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -579,7 +579,7 @@
 
 	__u8  bMaxBurst;
 	__u8  bmAttributes;
-	__u16 wBytesPerInterval;
+	__le16 wBytesPerInterval;
 } __attribute__ ((packed));
 
 #define USB_DT_SS_EP_COMP_SIZE		6