Add the compatible string for Meson8b in Meson pinctrl documentation
and add new information for Meson8b in source code comments.
Signed-off-by: NCarlo Caione <carlo@endlessm.com>
Acked-by: NBeniamino Galvani <b.galvani@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>