ekf2: simplify mag yaw reset request when transitioning to mag enabled

src/modules/ekf2/EKF/ekf.h

@@ -449,7 +449,6 @@ private:
 	bool _mag_yaw_reset_req{false};		///< true when a reset of the yaw using the magnetometer data has been requested
 	bool _mag_decl_cov_reset{false};	///< true after the fuseDeclination() function has been used to modify the earth field covariances after a magnetic field reset event.
 	bool _synthetic_mag_z_active{false};	///< true if we are generating synthetic magnetometer Z measurements
-	bool _non_mag_yaw_aiding_running_prev{false};  ///< true when heading is being fused from other sources that are not the magnetometer (for example EV or GPS).
 	bool _is_yaw_fusion_inhibited{false};		///< true when yaw sensor use is being inhibited
 
 	SquareMatrix24f P{};	///< state covariance matrix
@@ -848,9 +847,6 @@ private:
 	// control fusion of magnetometer observations
 	void controlMagFusion();
 
-	bool noOtherYawAidingThanMag() const;
-	bool otherHeadingSourcesHaveStopped();
-
 	void checkHaglYawResetReq();
 	float getTerrainVPos() const { return isTerrainEstimateValid() ? _terrain_vpos : _last_on_ground_posD; }