arm64: dts: allwinner: pinephone: Use generic sensor node names

Instead of duplicating part of the compatible string in the node name,
use generic names as recommended by (and listed in) section 2.2.2 of the
Devicetree Specification.

Suggested-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20201106032055.51530-1-samuel@sholland.org