delete unused ACCELIOCSLOWPASS

src/drivers/adis16448/adis16448.cpp

src/drivers/bma180/bma180.cpp

src/drivers/bmi055/bmi055_accel.cpp

src/drivers/bmi160/bmi160.cpp

src/drivers/drv_accel.h

src/drivers/fxos8701cq/fxos8701cq.cpp

src/drivers/lsm303d/lsm303d.cpp

src/drivers/mpu6000/mpu6000.cpp

src/drivers/mpu9250/mpu9250.cpp

src/platforms/posix/drivers/accelsim/accelsim.cpp

src/platforms/posix/drivers/gyrosim/gyrosim.cpp