This patch adds a CANFD device node for r8a779a0.

Based on patch by Kazuya Mizuguchi.
Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/20220309162609.3726306-3-uli+renesas@fpond.euSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>