delete unused IOCTLs ACCELIOCSSAMPLERATE and ACCEL_SAMPLERATE_DEFAULT

src/drivers/drv_accel.h

src/drivers/imu/adis16448/adis16448.cpp

src/drivers/imu/adis16477/ADIS16477.cpp

src/drivers/imu/bma180/bma180.cpp

src/drivers/imu/bmi055/BMI055_accel.cpp

src/drivers/imu/bmi160/bmi160.cpp

src/drivers/imu/fxos8701cq/fxos8701cq.cpp

src/drivers/imu/lsm303d/lsm303d.cpp

src/drivers/imu/mpu6000/mpu6000.cpp

src/drivers/imu/mpu9250/mpu9250.cpp

src/modules/simulator/accelsim/accelsim.cpp

src/modules/simulator/gyrosim/gyrosim.cpp

src/systemcmds/config/config.c