Add SDHI nodes to the DT of the r8a77965 SoC.

Based on several similar patches of the R8A7796 device tree
by Simon Horman <horms+renesas@verge.net.au>.
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>