[tf.data] If `parallelism` is set to `tf.data.AUTOTUNE` for an Op, sets its value to the smaller of 16 and number of schedulable CPUs when `GetNext()` is invoked on the Op. If `Autotune` is on, this number will be optimized to what `Autotune` thinks is the optimum value. If not, it stays at that value.
[tf.data] If `parallelism` is set to `tf.data.AUTOTUNE` for an Op, sets its value to the smaller of 16 and number of schedulable CPUs when `GetNext()` is invoked on the Op. If `Autotune` is on, this number will be optimized to what `Autotune` thinks is the optimum value. If not, it stays at that value.

PiperOrigin-RevId: 422844422
Change-Id: Ic8ed01d5a6882a91fb3c996dd20e0121aebf1a68

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