pinctrl: sh-pfc: r8a7795: Add USB3.0 host support

This patch adds USB3.0 ch0 pinmux support to R8A7795 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>