sh-pfc: sh7372: Add SDHCI and MMCIF pin groups and functions

Add pin groups for all three SDHI interfaces and two alternative pin
groups for the MMCIF interface on the sh7372 SoC.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>