Add all 4 android ABIs to android build script by default
The android build script (./scripts/build_pytorch_android.sh) is broken if user didn't provide the abi list.
./scripts/build_pytorch_android.sh ==> failed due to the so file for armv7 cannot be found
./scripts/build_pytorch_android.sh x86,x86_64 ==> works
This is because by default we will build 4 ABIs:
https://github.com/pytorch/pytorch/blob/0ca0e02685a9d033ac4f04e2fa5c8ba6dbc5ae50/android/gradle.properties#L1
but only one is provided in this script.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73063
