pwm_out, dshot: remove mode_* handling and capture ioctl's

They now use all unused pins, whereas camera_capture, camera_trigger and
pwm_input modules start before to reserve their pins.

src/drivers/camera_trigger/camera_trigger_params.c

@@ -131,15 +131,14 @@ PARAM_DEFINE_INT32(TRIG_MODE, 0);
  * Camera trigger pin
  *
  * Selects which FMU pin is used (range: AUX1-AUX8 on Pixhawk controllers with an I/O board,
- * MAIN1-MAIN8 on controllers without an I/O board. The PWM interface takes two pins per camera, while relay
+ * MAIN1-MAIN8 on controllers without an I/O board).
+ *
+ * The PWM interface takes two pins per camera, while relay
  * triggers on every pin individually. Example: Value 56 would trigger on pins 5 and 6.
  * For GPIO mode Pin 6 will be triggered followed by 5. With a value of 65 pin 5 will
  * be triggered followed by 6. Pins may be non contiguous. I.E. 16 or 61.
  * In GPIO mode the delay pin to pin is < .2 uS.
  *
- * Note: only with a value of 56 or 78 it is possible to use the lower pins for
- * actuator outputs (e.g. ESC's).
- *
  * @min 1
  * @max 12345678
  * @decimal 0