pinctrl: sh-pfc: r8a77990: Add USB2.0 pins, groups and functions

This patch adds USB0_{PWEN,OVC}_{A,B} and USB0_ID pins, groups and
functions to the R8A77990 SoC.

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>