regulator: Fixes for v4.16

A couple of fixes here:

 - Another half of the supend to idle fix from Geert that went in
   earlier, both he and I are confused as to why he didn't notice that
   this was missing when his earlier fix was merged.
 - A simple fix for a test done the wrong way round in the stm32-vrefbuf
   driver.
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Merge remote-tracking branches 'regulator/fix/resume' and 'regulator/fix/stm32-vfrefbuf' into regulator-linus