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

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>