lapic: disable microdelay because it makes Bochs slow

lapic.c

@@ -124,10 +124,6 @@ lapiceoi(void)
 void
 microdelay(int us)
 {
-  volatile int j = 0;
-  
-  while(us-- > 0)
-    for(j=0; j<10000; j++);
 }