drivers: heater: fix module build and startup

- Startup was broken due to unnecessary cyclic check probably introduced during transition to work_queues
- Module never used other than on Teal One which had a hacky heater input GPIO, this enables usage on general boards

drivers: heater: reduce verbosity and simplify commandline options

- We prefer the linux way of only reporting errors and staying quiet when everything is functioning as designed
- Most of the commandline options just read out the values of the system parameters, and one can just check the parameter values directly.

sensor_params: make thermal control parameters system parameters

heater_params: make thermal control parameters system parameters

drivers: heater: remove pin control hacks

- px4_arch_configgpio(GPIO_HEATER_OUTPUT) directly inits the heater pin to OFF, and as a PUSHPULL (TTL totem pole) OUTPUT

drivers: heater: set default device ID to 0

src/modules/sensors/sensor_params.c

@@ -1,6 +1,6 @@
 /****************************************************************************
  *
- *   Copyright (c) 2012-2017 PX4 Development Team. All rights reserved.
+ *   Copyright (c) 2012-2019 PX4 Development Team. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -207,6 +207,8 @@ PARAM_DEFINE_FLOAT(SENS_BOARD_Z_OFF, 0.0f);
  *
  * @value -1 Thermal control unavailable
  * @value 0 Thermal control off
+ * @value 1 Thermal control enabled
+ * @category system
  * @group Sensors
  */
 PARAM_DEFINE_INT32(SENS_EN_THERMAL, -1);