usb: host: xhci-rcar: update firmware for R-Car H3 and M3-W

This patch updates the firmware files for R-Car H3 and M3-W to fix
the device detection issue.

The md5sum of the files are:
645db7e905  r8a779x_usb3_v2.dlmem
687d5d42f3  r8a779x_usb3_v3.dlmem

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>