drivers: sensor: lsm6dl fixing -Wdouble-promotion warning

Fixing this "revealed" bug which got introduced when a PR
added the -Wdouble-promotion flag to GCC builds

Signed-off-by: Francois Ramu <francois.ramu@st.com>

Author: FRASTM

drivers/sensor/lsm6dsl/lsm6dsl.c

@@ -211,7 +211,7 @@ static int lsm6dsl_accel_range_set(const struct device *dev, int32_t range)
 		return -EIO;
 	}
 
-	data->accel_sensitivity = (float)(lsm6dsl_accel_fs_sens[fs]
+	data->accel_sensitivity = (double)(lsm6dsl_accel_fs_sens[fs]
 						    * SENSI_GRAIN_XL);
 	return 0;
 }
@@ -274,7 +274,7 @@ static int lsm6dsl_gyro_range_set(const struct device *dev, int32_t range)
 		return -EIO;
 	}
 
-	data->gyro_sensitivity = (float)(lsm6dsl_gyro_fs_sens[fs]
+	data->gyro_sensitivity = (double)(lsm6dsl_gyro_fs_sens[fs]
 						    * SENSI_GRAIN_G);
 	return 0;
 }

drivers/sensor/lsm6dsl/lsm6dsl.h

@@ -647,19 +647,19 @@ struct lsm6dsl_data {
 	int accel_sample_x;
 	int accel_sample_y;
 	int accel_sample_z;
-	float accel_sensitivity;
+	double accel_sensitivity;
 	int gyro_sample_x;
 	int gyro_sample_y;
 	int gyro_sample_z;
-	float gyro_sensitivity;
+	double gyro_sensitivity;
 #if defined(CONFIG_LSM6DSL_ENABLE_TEMP)
 	int temp_sample;
 #endif
 #if defined(CONFIG_LSM6DSL_EXT0_LIS2MDL) || defined(CONFIG_LSM6DSL_EXT0_LIS3MDL)
 	int magn_sample_x;
 	int magn_sample_y;
 	int magn_sample_z;
-	float magn_sensitivity;
+	double magn_sensitivity;
 #endif
 #if defined(CONFIG_LSM6DSL_EXT0_LPS22HB)
 	int sample_press;