ARM: dts: sun8i: h3: Refactor the pinctrl node names

The H3 and H5 have never been converted to the new convention we want to
have for the pinctrl nodes.

Convert them.

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