usb: dwc3: rename res_trans_idx to resource_index

resource_index is more human readable. No
functional changes.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d3e56cf..151eca8 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -404,7 +404,7 @@
  * @current_trb: index of current used trb
  * @number: endpoint number (1 - 15)
  * @type: set to bmAttributes & USB_ENDPOINT_XFERTYPE_MASK
- * @res_trans_idx: Resource transfer index
+ * @resource_index: Resource transfer index
  * @current_uf: Current uf received through last event parameter
  * @interval: the intervall on which the ISOC transfer is started
  * @name: a human readable name e.g. ep1out-bulk
@@ -438,7 +438,7 @@
 
 	u8			number;
 	u8			type;
-	u8			res_trans_idx;
+	u8			resource_index;
 	u16			current_uf;
 	u32			interval;