Reject requests to start or ack a suspend sequence on platforms that do not

support suspend/resume, currently all except i386.

Tested by:	jkim
Approved by:	re

sys/dev/acpica/acpi.c

@@ -2173,6 +2173,11 @@ acpi_ReqSleepState(struct acpi_softc *sc, int state)
 	    return (ENXIO);
     }
 
+#if !defined(__i386__)
+    /* This platform does not support acpi suspend/resume. */
+    return (EOPNOTSUPP);
+#endif
+
     /* If a suspend request is already in progress, just return. */
     ACPI_LOCK(acpi);
     if (sc->acpi_next_sstate != 0) {
@@ -2218,6 +2223,11 @@ acpi_AckSleepState(struct apm_clone_data *clone, int error)
     struct acpi_softc *sc;
     int ret, sleeping;
 
+#if !defined(__i386__)
+    /* This platform does not support acpi suspend/resume. */
+    return (EOPNOTSUPP);
+#endif
+
     /* If no pending sleep state, return an error. */
     ACPI_LOCK(acpi);
     sc = clone->acpi_sc;