arm: rmobile: alt: Add support SDHI
Alt board has two SDHI port. This adds GPIO configuration and initialization function of SDHI, and enables MMC command. Signed-off-by: NNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>
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