pinctrl: uniphier: add dedicated pins to pin tables of PH1-LD4/sLD8

These pins do not support pin-muxing, but it is useful to support
pin configuration for them.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>