ekf2: disable multi-EKF across mags by default (H7 & SITL) for now

- re-enable once the estimator selector respects configured mag
priority (at least initially) or is otherwise able to automatically
prefer an external mag over internal
 - for SITL disabled because the full matrix of esitmator instances
(IMUs X mags) was too many topics for logger currently

boards/atl/mantis-edu/init/rc.board_defaults

@@ -11,11 +11,6 @@ param set-default COM_ARM_SDCARD 0
 
 param set-default SENS_EXT_I2C_PRB 0
 
-param set-default EKF2_MULTI_IMU 1
-param set-default EKF2_MULTI_MAG 1
-param set-default SENS_IMU_MODE 0
-param set-default SENS_MAG_MODE 0
-
 param set-default EV_TSK_STAT_DIS 1
 
 param set-default SYS_DM_BACKEND 1

boards/px4/fmu-v5/init/rc.board_defaults

@@ -26,8 +26,6 @@ else
 	# Multi-EKF
 	param set-default EKF2_MULTI_IMU 2
 	param set-default SENS_IMU_MODE 0
-	param set-default EKF2_MULTI_MAG 2
-	param set-default SENS_MAG_MODE 0
 fi
 
 rgbled_pwm start