usb: renesas_usbhs: add pipe/fifo link

renesas_usbhs has CFIFO which is for PIO transfer,
and D0FIFO/D1FIFO which are for DMA transfer.
The pipe selects one of these fifo when it send/recv data.
But fifo must not be selected to different pipe in same time.
This patch add pipe/fifo link for each other,
and fifo is not selected by another pipe until it is unselected.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/renesas_usbhs/fifo.h

@@ -23,6 +23,8 @@ struct usbhs_fifo {
 	u32 port;	/* xFIFO */
 	u32 sel;	/* xFIFOSEL */
 	u32 ctr;	/* xFIFOCTR */
+
+	struct usbhs_pipe	*pipe;
 };
 
 struct usbhs_fifo_info {