regulator: Fixes for v4.0 The two main fixes here from Javier and Doug both fix issues seen on the Exynos-based ARM Chromebooks with reference counting of GPIO regulators over system suspend. The GPIO enable code didn't properly take account of this cases (a full analysis is in Doug's commit log). This is fixed by both fixing the reference counting directly and by making the resume code skip enables it doesn't need to do. We could skip the change in the resume code but it's a very simple change and adds extra robustness against problems in other drivers.