arm64: dts: renesas: r8a774b1: Add CAN and CAN FD support

Add CAN and CAN FD support to the RZ/G2N SoC specific dtsi.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Link: https://lore.kernel.org/r/1570717560-7431-4-git-send-email-fabrizio.castro@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>