Add watchdog kick while waiting for the network

Author: pennam

Diff for: src/ArduinoCellular.cpp

@@ -1,6 +1,9 @@
 
 
 #include "ArduinoCellular.h"
+#if defined(ARDUINO_ARCH_MBED)
+  #include "Watchdog.h"
+#endif
 
 unsigned long ArduinoCellular::getTime() {
     int year, month, day, hour, minute, second;
@@ -218,8 +221,13 @@ bool ArduinoCellular::awaitNetworkRegistration(){
         if(this->debugStream != nullptr){
             this->debugStream->print(".");
         }
+#if defined(ARDUINO_ARCH_MBED)
+        if(mbed::Watchdog::get_instance().is_running()) {
+            mbed::Watchdog::get_instance().kick();
+        }
+#endif
         delay(2000);
-    } 
+    }
     return true;
 }