arm64: dts: allwinner: pinebook: Remove unused AXP803 regulators

The Pinebook does not use the CSI bus on the A64. In fact it does not
use GPIO port E for anything at all. Thus the following regulators are
not used and do not need voltages set:

 - ALDO1: Connected to VCC-PE only
 - DLDO3: Not connected
 - ELDO3: Not connected

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>