pinctrl: renesas: sh73a0: Share SDHI pin group data

Pin groups sdhi[012]_data1 are subsets of sdhi[012]_data4.

This reduces kernel size by 24 bytes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/96a5be0c34c66b302e16e915a7cc6272783aa73c.1640269757.git.geert+renesas@glider.be