usb: host: xhci-plat: add firmware for the R-Car M3-W xHCI controllers

This patch adds a firmware for the USB 3.0 host controllers of Renesas
R-Car M3-W SoC.

 - This firmware is possible to be used on R-Car H2 and M2. However,
   this version causes performance degradation on such SoCs.
 - This firmware is impossible to be used on R-Car H3 because data
   transfer might not work correctly.

So, we would like to keep the v1 and v2 firmware.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -2922,10 +2922,11 @@ Licence:
 
 --------------------------------------------------------------------------
 
-Driver: xhci-rcar -- Renesas R-Car H2/M2/H3 USB 3.0 host controller driver
+Driver: xhci-rcar -- Renesas R-Car Gen2/3 USB 3.0 host controller driver
 
 File: r8a779x_usb3_v1.dlmem
 File: r8a779x_usb3_v2.dlmem
+File: r8a779x_usb3_v3.dlmem
 
 Licence: Redistributable. See LICENCE.r8a779x_usb3 for details.