Make minimum padding size to 2 in tpu.repliate.
Make minimum padding size to 2 in tpu.repliate.

XLA doesn't support the upperbound of dynamic dimension of 1. Make
minumum padding size to 2.

PiperOrigin-RevId: 276603306
Change-Id: I4b64f31adc4b62e160e831f05ccc2a2326ff6d6f

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