pinctrl: sh-pfc: r8a77470: Add VIN pin groups

Add VIN[01] pin groups and functions to the RZ/G1C (a.k.a.
R8A77470) pinctrl driver.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>