MCU8MASS-852 Set default of power down and not PSM for low power MQTT example and add declaration in debug_modem

Author: M65649

examples/debug_modem/debug_modem.ino

@@ -2,6 +2,8 @@
 #include <log.h>
 #include <sequans_controller.h>
 
+void debugBridgeUpdate(void);
+
 void setup() {
     Log.begin(115200);
     SequansController.begin();

examples/mqtt_low_power/mqtt_low_power.ino

@@ -13,7 +13,7 @@
 #include <mqtt_client.h>
 #include <veml3328.h>
 
-#define USE_PSM true
+#define USE_PSM false
 
 static char mqtt_pub_topic[128];