arm64: dts: allwinner: pinephone: Remove useless light sensor supplies

The stk3311 binding don't expect a vdd or leda power supplies. Remove
them.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://lore.kernel.org/r/20210114113538.1233933-17-maxime@cerno.tech