arch: xtensa: Fix the pause handler for SMP

Summary:
- Apply the same logic added to cxd56_cpupause.c

Impact:
- SMP only

Testing:
- Tested with esp32-core:smp (QEMU)
- Run smp and ostest

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

arch/xtensa/src/common/xtensa_cpupause.c

@@ -192,7 +192,18 @@ void xtensa_pause_handler(void)
 
   if (spin_islocked(&g_cpu_paused[cpu]))
     {
+      /* NOTE: up_cpu_paused() needs to be executed in a critical section
+       * to ensure that this CPU holds g_cpu_irqlock. However, adding
+       * a critical section in up_cpu_paused() is not a good idea,
+       * because it is also called in enter_critical_section() to break
+       * a deadlock
+       */
+
+      irqstate_t flags = enter_critical_section();
+
       up_cpu_paused(cpu);
+
+      leave_critical_section(flags);
     }
 }