Commit the hwsleep.c patch for suspend/resume onto the vendor branch.

This has supposedly been incorporated into the Intel code already, so this
will get cleanly replaced with the "official" version when it is next
imported and will not cause any conflicts or hiccups.

sys/contrib/dev/acpica/hwsleep.c

@@ -298,8 +298,10 @@ AcpiEnterSleepState (
     /* wait a second, then try again */
     AcpiOsStall(1000000);
 
-    AcpiHwRegisterWrite(ACPI_MTX_LOCK, PM1_CONTROL,
-        (1 << AcpiHwGetBitShift (SLP_EN_MASK)));
+    if (SleepState > ACPI_STATE_S1) {
+	AcpiHwRegisterWrite(ACPI_MTX_LOCK, PM1_CONTROL,
+	    (1 << AcpiHwGetBitShift (SLP_EN_MASK)));
+    }
 
     enable();