sched/irq: Remove the code which zero out g_irqvector fields

since the boot up code already do it

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

sched/irq/irq_initialize.c

@@ -73,17 +73,6 @@ void irq_initialize(void)
   for (i = 0; i < TAB_SIZE; i++)
     {
       g_irqvector[i].handler = irq_unexpected_isr;
-      g_irqvector[i].arg     = NULL;
-#ifdef CONFIG_SCHED_IRQMONITOR
-      g_irqvector[i].start   = 0;
-#ifdef CONFIG_HAVE_LONG_LONG
-      g_irqvector[i].count   = 0;
-#else
-      g_irqvector[i].mscount = 0;
-      g_irqvector[i].lscount = 0;
-#endif
-      g_irqvector[i].time    = 0;
-#endif
     }
 
 #ifdef CONFIG_IRQCHAIN