R-Mobile and R-Car ARM SoCs use sh_mmcif as MMC host driver. This adds arch-rmobile/mmc.h that defines mmcif_mmc_init(). Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>