usb: host: xhci-plat: add support for the R-Car H3 xHCI controllers
This patch adds a firmware for the USB 3.0 host controllers of Renesas
R-Car H3 SoC.
This firmware is possible to use on R-Car H2 and M2. However, this
version causes performance degradation on R-Car H2 and M2. So, we would
like to keep the v1 firmware.