stop manually defining physical constants

src/drivers/batt_smbus/batt_smbus.cpp

src/drivers/imu/adis16448/adis16448.cpp

src/drivers/imu/bma180/bma180.cpp

src/drivers/imu/bmi055/bmi055.hpp

src/drivers/imu/bmi055/bmi055_accel.cpp

src/drivers/imu/bmi160/bmi160.cpp

src/drivers/imu/bmi160/bmi160.hpp

src/drivers/imu/fxos8701cq/fxos8701cq.cpp

src/drivers/imu/lsm303d/lsm303d.cpp

src/drivers/imu/mpu6000/mpu6000.cpp

src/drivers/imu/mpu6000/mpu6000.h

src/drivers/imu/mpu9250/mpu9250.cpp

src/drivers/imu/mpu9250/mpu9250.h

src/drivers/telemetry/frsky_telemetry/CMakeLists.txt

src/drivers/telemetry/frsky_telemetry/frsky_data.cpp

src/drivers/telemetry/frsky_telemetry/frsky_telemetry.cpp

src/drivers/telemetry/frsky_telemetry/sPort_data.cpp

src/lib/ecl

src/modules/fw_pos_control_l1/FixedwingPositionControl.cpp

src/modules/fw_pos_control_l1/FixedwingPositionControl.hpp