pinctrl: renesas: r8a7796: Share SDHI pin group data

Pin groups sdhi[01]_data1 are subsets of sdhi[01]_data4.
Pin groups sdhi[23]_data[14] are subsets of sdhi[23]_data8.

This reduces kernel size by 96 bytes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/b638b7ad4a874e64a35057fa1ce6ab23db3406cf.1640269757.git.geert+renesas@glider.be