pinctrl: sh-pfc: r8a7796: Add MSIOF pins, groups and functions

This patch adds MSIOF{0,1,2,3} pins, groups and functions to R8A7796
SoC.
Signed-off-by: NTakeshi Kihara <takeshi.kihara.df@renesas.com>
[geert: Correct MSIOF3 SS1_E/SS2_E pins]
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>