Add ez_landing_speed parameter (#13411)

* Add ez_landing_speed parameter

The parameter is the speed at which ez_landing will be effectively disabled in tenths of meters per second.
Default value 50 (5 m/s).
EZLANDING bug field 5 is the contribution from this parameter to the ezlanding throttle cap.

* Correct ez_landing_speed logic and scaling

* ez_landing_speed should now raise the limit when the speed is above ez_landing_speed (previously only raised the limit if the speed was bellow, and had no effect above the limit)
* ez_landing_speed should now be scaled so that EzLanding is effectively disabled when speed >= ez_landing_speed (previously EzLanding would be disabeld when speed was at half of ez_landing_speed)

* Add stick input upper limit as EZLANDING debug 4

* Check for gps 3D fix before using gps speed for EzLanding

* Prevent division by 0 if ez_landing_threshold is set to 0

* Scale EzLanding speed to m/s from cm/s

* Update src/main/flight/mixer.c

Co-authored-by: Petr Ledvina <ledvinap@gmail.com>

---------

Co-authored-by: Mark Haslinghuis <mark@numloq.nl>
Co-authored-by: Petr Ledvina <ledvinap@gmail.com>

src/main/flight/pid.c

@@ -229,6 +229,7 @@ void resetPidProfile(pidProfile_t *pidProfile)
         .tpa_low_always = 0,
         .ez_landing_threshold = 25,
         .ez_landing_limit = 15,
+        .ez_landing_speed = 50,
     );
 
 #ifndef USE_D_MIN