pinctrl: nomadik: remove duplicate included header files

linux/seq_file.h is included more than once.

Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/202301161545238948580@zte.com.cn


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>