regulator: Updates for v5.9 This time around the bulk of the work on the regulator API has been cleanups of various kinds, partly but not entirely inspired by the W=1 stuff that 0day turned on. There's also been a fairly large crop of new drivers, and a few bugfixes for existing drivers. - Mode setting support for MT6397 and DA9211. - New drivers for ChromeOS embedded controllers, Fairchild FAN53880, NXP PCA9450, Qualcomm LABIBB, MP5496, and VBUS booster, and Silergy SY8827N