ACPI / PM: remove leading whitespace from #ifdef

It is there probably due to an accident, get rid of it so that the format
is consistent across the file.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge branch 'acpi-pm-next' into linux-next

* acpi-pm-next:
  ACPI / PM: remove leading whitespace from #ifdef