usb: dwc3: fix sparse errors

sparse caught three mistakes on this driver,
fix them:

drivers/usb/dwc3/ep0.c:806:29: warning: duplicate const
drivers/usb/dwc3/debugfs.c:481:15: warning: symbol 'dwc3_debugfs_init' \
	was not declared. Should it be static?
drivers/usb/dwc3/debugfs.c:518:16: warning: symbol 'dwc3_debugfs_exit' \
	was not declared. Should it be static?
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/dwc3/debugfs.c

@@ -49,6 +49,7 @@
 #include "core.h"
 #include "gadget.h"
 #include "io.h"
+#include "debug.h"
 
 struct dwc3_register {
 	const char	*name;

drivers/usb/dwc3/ep0.c

@@ -803,7 +803,7 @@ static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
 }
 
 void dwc3_ep0_interrupt(struct dwc3 *dwc,
-		const const struct dwc3_event_depevt *event)
+		const struct dwc3_event_depevt *event)
 {
 	u8			epnum = event->endpoint_number;