usb: renesas_usbhs: expand USB-DMAC channels for R-Car Gen2

This patch expands USB-DMAC channels for R-Car Gen2 SoCs. The SoCs
have 4 channels. If d{2,3}_{t,x}x_id are not set, this driver never
uses the expanded USB-DMAC channels.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --cc drivers/usb/renesas_usbhs/common.h
Simple merge

diff --cc drivers/usb/renesas_usbhs/fifo.c
Simple merge

diff --cc drivers/usb/renesas_usbhs/fifo.h
Simple merge

diff --cc include/linux/usb/renesas_usbhs.h
Simple merge