fix: device PMU shutdown (part 2) #3596
Merged
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The shutdown for devices with PMU (tbeam, T-Watch) seems broken. E.g. a shutdown tbeam still consumes around 10mA and since #3162 the screen even stays on (showing "Shutdown...") when shutdown.
This PR fixes Power::shutdown() and redirects the PMU shutdown into the deep sleep branch to switch off all uneccesary peripherals before the pmu shutdown.
The tbeam v1.1 deep sleep power consumption (when using the Lilygo 1.3" display) dropped from 10mA to 1mA.