Merge 'bhi160: Allow to re-open the sensor from Python'

Closes #210

See merge request card10/firmware!409

pycardium/modules/py/bhi160.py

@@ -18,6 +18,11 @@ class BHI160:
     def enable_sensor(self):
         interrupt.disable_callback(self.interrupt_id)
         interrupt.set_callback(self.interrupt_id, self._interrupt)
+
+        # If the sensor is already enabled, disable it first.
+        # The call is allowed to silently fail.
+        sys_bhi160.disable_sensor(self.sensor_id)
+
         self.stream_id = sys_bhi160.enable_sensor(
             self.sensor_id, self.sample_buffer_len, self.sample_rate, self.dynamic_range
         )