Pin groups mmc_data[14] are subsets of mmc_data8.

This reduces kernel size by 40 bytes.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/32d708f423a3f0aa6c3cc87a9d5d3fa6686ab8c7.1640269757.git.geert+renesas@glider.be