usb: dwc3: add a flags field to event buffer

that way we know if a particular event buffer
has pending events, or not.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.h

@@ -369,6 +369,8 @@ struct dwc3_trb;
  * @list: a list of event buffers
  * @buf: _THE_ buffer
  * @length: size of this buffer
+ * @lpos: event offset
+ * @flags: flags related to this event buffer
  * @dma: dma_addr_t
  * @dwc: pointer to DWC controller
  */
@@ -376,6 +378,9 @@ struct dwc3_event_buffer {
 	void			*buf;
 	unsigned		length;
 	unsigned int		lpos;
+	unsigned int		flags;
+
+#define DWC3_EVENT_PENDING	BIT(0)
 
 	dma_addr_t		dma;