drivers/firmware: psci: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. Also adds missing call to
destroy_timer_on_stack().

Cc: Mark Rutland <[e-mail]>
Cc: Lorenzo Pieralisi <[e-mail]>
Cc: [e-mail]
Signed-off-by: Kees Cook <[e-mail]>

drivers/firmware/psci_checker.c

···
 	return err;
 }
 
-static void dummy_callback(unsigned long ignored) {}
+static void dummy_callback(struct timer_list *unused) {}
 
 static int suspend_cpu(int index, bool broadcast)
 {
···
 	pr_info("CPU %d entering suspend cycles, states 1 through %d\n",
 		cpu, drv->state_count - 1);
 
-	setup_timer_on_stack(&wakeup_timer, dummy_callback, 0);
+	timer_setup_on_stack(&wakeup_timer, dummy_callback, 0);
 	for (i = 0; i < NUM_SUSPEND_CYCLE; ++i) {
 		int index;
 		/*