pinctrl: sh-pfc: r8a77965: Add VIN[4|5] groups/functions

The VIN4 and VIN5 interfaces support parallel video input.
Add pin, mux and functions definitions for VIN4 and VIN5 for R-Car M3-N.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>