pinctrl: sh-pfc: remove unused PINMUX_IPSR_MODSEL_DATA()

Now, all PINMUX_IPSR_MODSEL_DATA() are replased to PINMUX_IPSR_MSEL()
Let's remove unused PINMUX_IPSR_MODSEL_DATA()

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>