pinctrl: renesas: r8a7791: Share HSCIF1 pin group data

Pin group hscif1_data_e can be an alias for hscif1_data_c.

This reduces kernel size by 16 bytes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/5afdfcaa24d41ebc50af37ff5da055203744f8b5.1640269757.git.geert+renesas@glider.be