delete unused IOCTLs ACCELIOCSSAMPLERATE and ACCEL_SAMPLERATE_DEFAULT

src/drivers/imu/bmi055/BMI055_accel.cpp

@@ -415,9 +415,6 @@ BMI055_accel::ioctl(struct file *filp, int cmd, unsigned long arg)
 			return OK;
 		}
 
-	case ACCELIOCSSAMPLERATE:
-		return accel_set_sample_rate(arg);
-
 	case ACCELIOCSSCALE: {
 			/* copy scale, but only if off by a few percent */
 			struct accel_calibration_s *s = (struct accel_calibration_s *) arg;