Update Payload_BME280_MPU6050_XS.ino don't go gps if not Pico

stempayload/Payload_BME280_MPU6050_XS/Payload_BME280_MPU6050_XS.ino

@@ -419,6 +419,7 @@ int read_analog()
 }
 
 void get_gps() {
+#ifdef ARDUINO_ARCH_RP2040	
   bool newData = false;  
   unsigned long start = millis();	
 	
@@ -463,4 +464,5 @@ void get_gps() {
   } else
 //	    Serial.printf("GPS read no new data: %d\n", millis() - start);	      
     ;
+#endif	
 }