ekf2: consolidate GNSS yaw in gnss_yaw_control.cpp and fix naming (GPS->GNSS)

Co-authored-by: Mathieu Bresciani <brescianimathieu@gmail.com>

src/modules/ekf2/EKF/common.h

@@ -338,7 +338,7 @@ struct parameters {
 
 # if defined(CONFIG_EKF2_GNSS_YAW)
 	// GNSS heading fusion
-	float gps_heading_noise{0.1f};          ///< measurement noise standard deviation used for GNSS heading fusion (rad)
+	float gnss_heading_noise{0.1f};          ///< measurement noise standard deviation used for GNSS heading fusion (rad)
 # endif // CONFIG_EKF2_GNSS_YAW
 
 	// Parameters used to control when yaw is reset to the EKF-GSF yaw estimator value
@@ -580,7 +580,7 @@ uint64_t gnd_effect              :
 		1; ///< 20 - true when protection from ground effect induced static pressure rise is active
 uint64_t rng_stuck               :
 		1; ///< 21 - true when rng data wasn't ready for more than 10s and new rng values haven't changed enough
-uint64_t gps_yaw                 :
+uint64_t gnss_yaw                 :
 		1; ///< 22 - true when yaw (not ground course) data fusion from a GPS receiver is intended
 		uint64_t mag_aligned_in_flight   : 1; ///< 23 - true when the in-flight mag field alignment has been completed
 uint64_t ev_vel                  :
@@ -588,7 +588,7 @@ uint64_t ev_vel                  :
 uint64_t synthetic_mag_z         :
 		1; ///< 25 - true when we are using a synthesized measurement for the magnetometer Z component
 		uint64_t vehicle_at_rest         : 1; ///< 26 - true when the vehicle is at rest
-uint64_t gps_yaw_fault           :
+uint64_t gnss_yaw_fault           :
 		1; ///< 27 - true when the GNSS heading has been declared faulty and is no longer being used
 uint64_t rng_fault               :
 		1; ///< 28 - true when the range finder has been declared faulty and is no longer being used