Add pins, groups, and functions for the Quad SPI Controllers on the
Renesas R-Car S4-8 (R8A779F0) SoC.

Based on a larger patch in the BSP by LUU HOAI.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/cd7f7feeabebf268adc9e050e348230e93b40829.1645457792.git.geert+renesas@glider.be