pinctrl: sh-pfc: r8a7795-es1: Add HDMI pins, groups and functions

This patch adds HDMI0 CEC pin, group and function to
the R8A7795 ES1.x SoC.

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[uli: fixed typo in comment]
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>