ARM: dts: sun9i: Remove useless reset and clock names

The MMC configuration clock controller in the A80 definition has a
clock-names and reset-names property, even though the binding for that
controller doesn't declare it.

Remove it.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>