Adds TensorFlow-Federated (TFF) to TF2XLA friends build visibility.
Adds TensorFlow-Federated (TFF) to TF2XLA friends build visibility.

TFF is in the process of implementing JAX support for its C++ datacenter runtime, and would love access to some symbols for converting CC data from TF to XLA representations.

Adds a patch to TFF's TF source dep which can be reverted when we update to a version that contains this change.

PiperOrigin-RevId: 461681693

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