regulator: Updates for v5.6 Hardly anything going on in the core this time around with the regulator API and pretty quiet on the driver front: - An API for comparing regulators, useful for devices that need to check if supply voltages exactly match rather than just nominally match. - Conversion of several DT bindings to YAML format. - Conversion of I2C drivers to probe_new(). - New drivers for Monolithic MPQ7920 and MP8859, and Rohm BD71828.