cpuidle: update the last_state acpi cpuidle reflecting actual state entered

reflect the actual state entered in dev->last_state, when actaul state entered
is different from intended one.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/processor_idle.c

@@ -1587,6 +1587,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
 
 	if (acpi_idle_bm_check()) {
 		if (dev->safe_state) {
+			dev->last_state = dev->safe_state;
 			return dev->safe_state->enter(dev, dev->safe_state);
 		} else {
 			local_irq_disable();