DMP functions for the MPU 6500 and MPU 9250

[IgnacioRubioScola]

Hi!

Thank you for this wonderful library!

I think that it would be really nice to have DMP functions for the 6500 (and also the 9250).

I found that the DMP has already been implemented for the MPU9250 in: SparkFun_MPU-9250-DMP_Arduino_Library

Headers and functions for using the DMP are defined in: SparkFunMPU9250-DMP.h SparkFunMPU9250-DMP.cpp

Thank you again for your time!