sim/framebuffer: remove duplicate poll notify

The framebuffer of the emulator is a single buffer mode, and the pan_display method is not implemented, so as long as the fb device is created and poll notify once, the fb can be kept in a writable state.

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>

arch/sim/src/sim/sim_framebuffer.c

@@ -424,12 +424,8 @@ void sim_x11loop(void)
 
   if (now - last >= MSEC2TICK(16))
     {
-      if (sim_x11update() >= 0)
-        {
-          fb_pollnotify(&g_fbobject);
-        }
-
       last = now;
+      sim_x11update();
     }
 #endif
 }