pinctrl: sh-pfc: sh7757: Fix duplicate initializer in GPIO pinmux data

With C=1:

    drivers/pinctrl/sh-pfc/pfc-sh7757.c:1613:9: warning: Initializer entry defined twice
    drivers/pinctrl/sh-pfc/pfc-sh7757.c:1628:9:   also defined here

Remove the duplicate initializer to fix this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>