delete unused GYROIOCGEXTERNAL

src/drivers/drv_gyro.h

@@ -94,9 +94,6 @@ struct gyro_calibration_s {
 /** check the status of the sensor */
 #define GYROIOCSELFTEST		_GYROIOC(8)
 
-/** determine if hardware is external or onboard */
-#define GYROIOCGEXTERNAL	_GYROIOC(12)
-
 /** get the current gyro type */
 #define GYROIOCTYPE			_GYROIOC(13)
 

src/drivers/mpu6000/mpu6000.cpp

@@ -1583,9 +1583,6 @@ MPU6000::gyro_ioctl(struct file *filp, int cmd, unsigned long arg)
 	case GYROIOCSELFTEST:
 		return gyro_self_test();
 
-	case GYROIOCGEXTERNAL:
-		return _interface->ioctl(cmd, dummy);
-
 	default:
 		/* give it to the superclass */
 		return CDev::ioctl(filp, cmd, arg);