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.

Bug: 193012662
Bug: 200281183
Test: mm
Change-Id: Iabe45c57e2306d61055f711eda03b80b9cbe906d
Merged-In: Iabe45c57e2306d61055f711eda03b80b9cbe906d