mpu9250: create dedicated i2c version and delete legacy driver

- update crazyflie and bbblue usage
 - eventually this should be merged with the SPI version after interface
changes are made

boards/bitcraze/crazyflie/default.cmake

@@ -11,7 +11,8 @@ px4_add_board(
 		barometer/lps25h
 		distance_sensor/vl53l0x
 		gps
-		imu/mpu9250
+		magnetometer/akm/ak8963
+		imu/invensense/mpu9250
 		optical_flow/pmw3901
 		pwm_out
 	MODULES
@@ -23,9 +24,9 @@ px4_add_board(
 		events
 		flight_mode_manager
 		land_detector
-		landing_target_estimator
+		#landing_target_estimator
 		load_mon
-		local_position_estimator
+		#local_position_estimator
 		logger
 		mavlink
 		mc_att_control

boards/bitcraze/crazyflie/init/rc.board_sensors

@@ -6,10 +6,11 @@
 board_adc start
 
 # Onboard I2C
-mpu9250 -I -R 12 start
-
-# I2C bypass of mpu
-lps25h -I start
+if mpu9250_i2c -I -b 3 -a 0x69 -R 6 start; then
+	sleep 1 # wait for mpu9250 to be configured with bypass enabled
+	ak8963 -I -b 3 -R 4 start
+	lps25h -I -b 3 start
+fi
 
 # Optical flow deck
 vl53l0x start -X