ARM: dts: sun9i: Rename pinctrl nodes to avoid warnings

Our pinctrl node names were containing unit-adresses without a reg
property, resulting in a warning. Change the names for our new convention.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>