pinctrl: renesas: r8a77470: Share SDHI pin group data

Pin groups sdhi[02]_data1 are subsets of sdhi[02]_data4.

This reduces kernel size by 16 bytes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/9888bbd36ec207d6e5ece6c661e2fb8bc05a7dd6.1640269757.git.geert+renesas@glider.be