Move Aidl utility code to aidl/utils -- hal 1/2

This change is part of an effort to remove HAL types from
libneuralnetworks_common*. This change moves the following files to
hardware/interfaces/neuralnetworks/aidl/utils:
* AidlBufferTracker.h
* AidlHalInterfaces.h
* AidlHalUtils.h
* AidlValidateHal.h

Bug: 191442336
Test: mma
Change-Id: I799d8ba761c004af963fc6bc044125d8828f2053