pm: Fix case when forced state is not set

pm_suspend is returning early if there are no states
available (due to locking or latency policy). However,
if state is forced it should not return but rather enter
forced power state.

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

subsys/pm/pm.c

@@ -147,7 +147,7 @@ bool pm_system_suspend(int32_t kernel_ticks)
 
 	SYS_PORT_TRACING_FUNC_ENTER(pm, system_suspend, kernel_ticks);
 
-	if (!pm_policy_state_any_active()) {
+	if (!pm_policy_state_any_active() && (z_cpus_pm_forced_state[id] == NULL)) {
 		/* Return early if all states are unavailable. */
 		return false;
 	}