Add "alwayslink = 1" to the "quantize_training" target.
Add "alwayslink = 1" to the "quantize_training" target.

This fixes the tensorflow_serving OSS BUILD, which otherwise fails with the error:

```
ERROR: b8adf29dc1950836209d098307b98650d97466c1@org_tensorflow//tensorflow/python/keras/api:keras_python_api_gen_compat_v1 failed (Exit 1)
> > ImportError: /tmpfs/tmp/bazel/execroot/tf_serving/bazel-out/host/bin/external/org_tensorflow/tensorflow/python/keras/api/create_tensorflow.python_api_keras_python_api_gen_compat_v1.runfiles/org_tensorflow/tensorflow/python/_pywrap_quantize_training.so: undefined symbol: _ZN10tensorflow38DoQuantizeTrainingOnSerializedGraphDefERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEiS7_PS5_
```
PiperOrigin-RevId: 309514904
Change-Id: Ib4834d8e03f9193c7dafe096c697d9e5ef45f875

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