- According to https://bugzilla.kernel.org/show_bug.cgi?id=50711#c9,
  REGULATOR_DUMMY should be set to 'y' only for development purposes.
  It cannot be set to 'm', so the only option left is setting it to 'n'.
- The above change allows to remove 2 patches from kernel-small_fixes,
  which were added to make my SD card reader work - now it works without
  them.