AP_OpticalFlow: Remove unused device ID tracking

libraries/AP_OpticalFlow/AP_OpticalFlow_CXOF.cpp

@@ -158,7 +158,6 @@ void AP_OpticalFlow_CXOF::update(void)
     }
 
     struct OpticalFlow::OpticalFlow_state state {};
-    state.device_id = 0x43; // 'C'
 
     // average surface quality scaled to be between 0 and 255
     state.surface_quality = (constrain_int16(qual_sum / count, 64, 78) - 64) * 255 / 14;

libraries/AP_OpticalFlow/AP_OpticalFlow_MAV.cpp

@@ -46,7 +46,6 @@ void AP_OpticalFlow_MAV::update(void)
 
     struct OpticalFlow::OpticalFlow_state state {};
 
-    state.device_id = sensor_id;
     state.surface_quality = quality_sum / count;
 
     // calculate dt

libraries/AP_OpticalFlow/AP_OpticalFlow_Onboard.cpp

@@ -53,7 +53,6 @@ void AP_OpticalFlow_Onboard::update()
     }
 
     struct OpticalFlow::OpticalFlow_state state;
-    state.device_id = OPTICALFLOW_ONBOARD_ID;
     state.surface_quality = data_frame.quality;
     if (data_frame.delta_time > 0) {
         const Vector2f flowScaler = _flowScaler();

libraries/AP_OpticalFlow/AP_OpticalFlow_PX4Flow.cpp

@@ -114,7 +114,6 @@ void AP_OpticalFlow_PX4Flow::timer(void)
         return;
     }
     struct OpticalFlow::OpticalFlow_state state {};
-    state.device_id = get_address();
 
     if (frame.integration_timespan > 0) {
         const Vector2f flowScaler = _flowScaler();

libraries/AP_OpticalFlow/AP_OpticalFlow_Pixart.cpp

@@ -330,7 +330,6 @@ void AP_OpticalFlow_Pixart::update(void)
     last_update_ms = now;
 
     struct OpticalFlow::OpticalFlow_state state;
-    state.device_id = 1;
     state.surface_quality = burst.squal;
 
     if (integral.sum_us > 0) {

libraries/AP_OpticalFlow/AP_OpticalFlow_SITL.cpp

@@ -66,7 +66,6 @@ void AP_OpticalFlow_SITL::update(void)
                       radians(_sitl->state.yawDeg));
 
 
-    state.device_id = 1;
     state.surface_quality = 51;
 
     // sensor position offset in body frame

libraries/AP_OpticalFlow/OpticalFlow.h

@@ -76,14 +76,10 @@ public:
     // velocity - returns the velocity in m/s
     const Vector2f& bodyRate() const { return _state.bodyRate; }
 
-    // device_id - returns device id
-    uint8_t device_id() const { return _state.device_id; }
-
     // last_update() - returns system time of last sensor update
     uint32_t last_update() const { return _last_update_ms; }
 
     struct OpticalFlow_state {
-        uint8_t device_id;          // device id
         uint8_t  surface_quality;   // image quality (below TBD you can't trust the dx,dy values returned)
         Vector2f flowRate;          // optical flow angular rate in rad/sec measured about the X and Y body axis. A RH rotation about a sensor axis produces a positive rate.
         Vector2f bodyRate;          // body inertial angular rate in rad/sec measured about the X and Y body axis. A RH rotation about a sensor axis produces a positive rate.