regulator: Updates for v4.7 A few core enhancements to deal with some of the slightly more complicated edge cases that have started cropping up in systems, both new ones and old ones that people started worrying about upstream, but otherwise a quiet release for the regulator API: - When applying constraints at system image if we have a voltage range specified and the regulator is currently configured outside the bounds of that range bring the regulator to the nearest end of the range. - When regulators are in non-regulating bypass modes make sure that we always use the voltage from the parent regulator. - Support for LP873x, PV88080, PM8894 and FAN53555 chips.