AP_InertialSensor: add LSM9DS1 entry

Enable LSM9DS1 in case it is selected

libraries/AP_InertialSensor/AP_InertialSensor.cpp

@@ -16,6 +16,7 @@
 #include "AP_InertialSensor_HIL.h"
 #include "AP_InertialSensor_L3G4200D.h"
 #include "AP_InertialSensor_LSM9DS0.h"
+#include "AP_InertialSensor_LSM9DS1.h"
 #include "AP_InertialSensor_Invensense.h"
 #include "AP_InertialSensor_PX4.h"
 #include "AP_InertialSensor_QURT.h"
@@ -684,6 +685,7 @@ AP_InertialSensor::init(uint16_t sample_rate)
 
 bool AP_InertialSensor::_add_backend(AP_InertialSensor_Backend *backend)
 {
+
     if (!backend) {
         return false;
     }
@@ -849,6 +851,8 @@ AP_InertialSensor::detect_backends(void)
 #elif HAL_INS_DEFAULT == HAL_INS_EDGE
     ADD_BACKEND(AP_InertialSensor_Invensense::probe(*this, hal.spi->get_device(HAL_INS_MPU60x0_NAME), ROTATION_YAW_90));
     ADD_BACKEND(AP_InertialSensor_Invensense::probe(*this, hal.spi->get_device(HAL_INS_MPU60x0_NAME_EXT), ROTATION_YAW_90));
+#elif HAL_INS_DEFAULT == HAL_INS_LSM9DS1
+    ADD_BACKEND(AP_InertialSensor_LSM9DS1::probe(*this, hal.spi->get_device(HAL_INS_LSM9DS1_NAME)));
 #elif HAL_INS_DEFAULT == HAL_INS_LSM9DS0
     ADD_BACKEND(AP_InertialSensor_LSM9DS0::probe(*this,
                  hal.spi->get_device(HAL_INS_LSM9DS0_G_NAME),