Reduce CPU usage at boot time

If many drivers has been enabled, there is a peak of CPU usage at boot time that it is translated as a peak in power consumption. This address to a wifi connection issue in poor power regulated devices like Sonoff Basic R2. This fix reduces cpu usage making the wifi connection to establish faster.

sonoff/xdrv_interface.ino

@@ -249,6 +249,9 @@ boolean XdrvCall(byte Function)
   boolean result = false;
 
   for (byte x = 0; x < xdrv_present; x++) {
+    if (!((WL_CONNECTED == WiFi.status()) && (static_cast<uint32_t>(WiFi.localIP()) != 0))) {
+      delay(1);
+    }
     result = xdrv_func_ptr[x](Function);
     if (result) break;
   }