AP_Windvane: move RC_IN_NO to RCx_OPTION

libraries/AP_WindVane/AP_WindVane.cpp

@@ -35,13 +35,7 @@ const AP_Param::GroupInfo AP_WindVane::var_info[] = {
     // @RebootRequired: True
     AP_GROUPINFO_FLAGS("TYPE", 1, AP_WindVane, _direction_type, 0, AP_PARAM_FLAG_ENABLE),
 
-    // @Param: RC_IN_NO
-    // @DisplayName: Wind vane sensor RC Input Channel
-    // @Description: RC Input Channel to use as wind angle value
-    // @Range: 0 16
-    // @Increment: 1
-    // @User: Standard
-    AP_GROUPINFO("RC_IN_NO", 2, AP_WindVane, _rc_in_no, 0),
+    // 2 was RC_IN_NO
 
     // @Param: DIR_PIN
     // @DisplayName: Wind vane analog voltage pin for direction

libraries/AP_WindVane/AP_WindVane.h

@@ -98,7 +98,6 @@ private:
 
     // parameters
     AP_Int8 _direction_type;                        // type of windvane being used
-    AP_Int8 _rc_in_no;                              // RC input channel to use
     AP_Int8 _dir_analog_pin;                        // analog pin connected to wind vane direction sensor
     AP_Float _dir_analog_volt_min;                  // minimum voltage read by windvane
     AP_Float _dir_analog_volt_max;                  // maximum voltage read by windvane

libraries/AP_WindVane/AP_WindVane_Home.cpp

@@ -25,8 +25,8 @@ void AP_WindVane_Home::update_direction()
 {
     float direction_apparent_ef = _frontend._home_heading;
 
-    if (_frontend._direction_type == _frontend.WINDVANE_PWM_PIN && _frontend._rc_in_no != 0) {
-        RC_Channel *chan = rc().channel(_frontend._rc_in_no-1);
+    if (_frontend._direction_type == _frontend.WINDVANE_PWM_PIN) {
+        RC_Channel *chan = rc().find_channel_for_option(RC_Channel::AUX_FUNC::WIND_VANE_DIR_OFSSET);
         if (chan != nullptr) {
             direction_apparent_ef += chan->norm_input() * radians(45);
         }