pinctrl: renesas: r8a779g0: Add missing ERROROUTC_A

This patch adds missing ERROROUTC_A settings.
Current existing ERROROUTC should be _B, this patch tidies it up.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87mtdtsj8m.wl-kuninori.morimoto.gx@renesas.com


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