copy code remove g from example MPU6050 DMP

1.use MPU6050_6Axis_MotionApps20.h instead of MPU6050.h
2. Change variable from accelgyro to mpu
3. comment variable ax,ay,az,gx,gy,gz
4.comment define output readable accelgyro
5. copy code from DMP(define output_readable_realaccel)