AIDL interface changes for NNAPI feature level 6.

- Add BATCH_MATMUL operation
- Support TENSOR_INT32 for RESHAPE operation.

Also update "current" version snapshot and use
android.hardware.neuralnetworks-V2-ndk since AIDL v1 has been frozen.

Cherrypicked from Iabe45c57e2306d61055f711eda03b80b9cbe906d

Bug: 206089870
Test: mm
Change-Id: Iabe45c57e2306d61055f711eda03b80b9cbe906d
Merged-In: Iabe45c57e2306d61055f711eda03b80b9cbe906d
(cherry picked from commit aaeda0e8)