pinctrl/nomadik: update other alternate-C functions on DB8500

In pinctrl-nomadik-db8500.c, add missing definitions that deal
with other alternate-C functions.

Signed-off-by: Jean-Nicolas Graux <jean-nicolas.graux@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>