usb: gadget: udc: renesas_usb3: add support for r8a774c0

RZ/G2E USB 3.0 implementation is like the one found on R-Car E3,
therefore add the same quirk.

Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>