Merge "Add new armv8-2a-dotprod arch variant support." am: 9f5b7aa9 am: 00c43dfa

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# Copyright (C) 2020 The Android Open Source Project

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# Licensed under the Apache License, Version 2.0 (the "License");

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# .mk file required to support build for the new armv8-2a-dotprod Arm64 arch

# variant. The file just needs to be present but does not require to contain

# anything