pinctrl: sh-pfc: r8a7794: add SDHI pin groups

Add SDHI0/1/2 pin groups to R8A7794 PFC driver.

Signed-off-by: Shinobu Uehara <shinobu.uehara.xc@renesas.com>
[Sergei: renamed SD data pins to match the driver, rebased, renamed, added
changelog.]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

(cherry picked from commit 7ac91bda

)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>