ACPI fixes for v4.15-rc2

 - Fix an ACPI EC driver regression (from the 4.9 cycle) causing
   the driver's power management operations to be omitted during
   system suspend/resume on platforms where the EC instance from the
   ECDT table is used instead of the one from the DSDT (Lv Zheng).

 - Prevent modalias from being exposed to user space for ACPI device
   objects with _STA returning 0 (not present and not functional) to
   prevent driver modules from being loaded automatically for
   hardware that is not actually present on some platforms (Hans
   de Goede).
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