pinctrl: renesas: r8a7740: 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/e07ae7b52efba55cc210d52de6a771129dd8a3b0.1640269757.git.geert+renesas@glider.be