cns3xxx: don't use invalid mask value for clock events

According to a commit from kernel 4.18-rc3, it's not valid
to use "cpu_mask_all" for clock events and it should be
replaced in favor of "cpu_possible_mask" [1]

This warning was seen when booting kernel 4.19 on a cns3xxx board.
Let's fix it also here just to be safe.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.19.18&id=fbfa9260085b5b578a049a90135e5c51928c5f7f

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/cns3xxx/patches-4.14/090-timers.patch

@@ -17,15 +17,17 @@
  	writel(reload, cns3xxx_tmr1 + TIMER1_AUTO_RELOAD_OFFSET);
  	ctrl |= (1 << 0) | (1 << 2) | (1 << 9);
  	writel(ctrl, cns3xxx_tmr1 + TIMER1_2_CONTROL_OFFSET);
-@@ -175,7 +176,7 @@ static struct clock_event_device cns3xxx
+@@ -175,8 +176,8 @@ static struct clock_event_device cns3xxx
  	.set_state_oneshot	= cns3xxx_set_oneshot,
  	.tick_resume		= cns3xxx_shutdown,
  	.set_next_event		= cns3xxx_timer_set_next_event,
 -	.rating			= 350,
+-	.cpumask		= cpu_all_mask,
 +	.rating			= 300,
- 	.cpumask		= cpu_all_mask,
++	.cpumask		= cpu_possible_mask,
  };
  
+ static void __init cns3xxx_clockevents_init(unsigned int timer_irq)
 @@ -220,6 +221,32 @@ static void __init cns3xxx_init_twd(void
  	twd_local_timer_register(&cns3xx_twd_local_timer);
  }