cpu/hotplug: Remove redundant state check

The check for the AP range in cpuhp_is_ap_state() is redundant after commit
8df3e07e "cpu/hotplug: Let upcoming cpu bring itself fully up" because all
states above CPUHP_BRINGUP_CPU are invoked on the hotplugged cpu. Remove it.
Reported-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/cpu.c

@@ -1231,8 +1231,6 @@ static int cpuhp_cb_check(enum cpuhp_state state)
 
 static bool cpuhp_is_ap_state(enum cpuhp_state state)
 {
-	if (state >= CPUHP_AP_OFFLINE && state <= CPUHP_AP_ONLINE)
-		return true;
 	return state > CPUHP_BRINGUP_CPU;
 }