USB: c67x00: Remove unused declaration c67x00_hcd_msg_received()

Commit e9b29ffc ("USB: add Cypress c67x00 OTG controller HCD driver")
declared but never implemented this.
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20230825091518.22180-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/c67x00/c67x00-hcd.h

@@ -109,7 +109,6 @@ int c67x00_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
 void c67x00_endpoint_disable(struct usb_hcd *hcd,
 			     struct usb_host_endpoint *ep);
 
-void c67x00_hcd_msg_received(struct c67x00_sie *sie, u16 msg);
 void c67x00_sched_kick(struct c67x00_hcd *c67x00);
 int c67x00_sched_start_scheduler(struct c67x00_hcd *c67x00);
 void c67x00_sched_stop_scheduler(struct c67x00_hcd *c67x00);