intel: thermal: PCH: Drop ACPI_FADT_LOW_POWER_S0 check

If ACPI_FADT_LOW_POWER_S0 is not set, this doesn't mean that low-power
S0 idle is not usable.  It merely means that using S3 on the given
system is more beneficial from the energy saving perspective than using
low-power S0 idle, as long as S3 is supported.

Suspend-to-idle is still a valid suspend mode if ACPI_FADT_LOW_POWER_S0
is not set and the pm_suspend_via_firmware() check in pch_wpt_suspend()
is sufficient to distinguish suspend-to-idle from S3, so drop the
confusing ACPI_FADT_LOW_POWER_S0 check.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/intel/intel_pch_thermal.c

@@ -207,14 +207,6 @@ static int pch_wpt_suspend(struct pch_thermal_device *ptd)
 		return 0;
 	}
 
-	/* Do not check temperature if it is not a S0ix capable platform */
-#ifdef CONFIG_ACPI
-	if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
-		return 0;
-#else
-	return 0;
-#endif
-
 	/* Do not check temperature if it is not s2idle */
 	if (pm_suspend_via_firmware())
 		return 0;