Freeze neuralnetworks AIDL version as v2 for FL6

$ m android.hardware.neuralnetworks-update-api
$ m android.hardware.neuralnetworks-freeze-api

Cherrypicked from I35dbd32695acdffc552790dc7396bc8c724e9242

Bug: 206089870

Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksTargetTest
Change-Id: I35dbd32695acdffc552790dc7396bc8c724e9242
Merged-In: I35dbd32695acdffc552790dc7396bc8c724e9242
(cherry picked from commit 2a889d50b78fd2e981af5ed4b51ebb446eea02ba)
42 files changed