FIx jax2tf breakge of iota

PiperOrigin-RevId: 688146581

Author: yashk2810

jax/experimental/jax2tf/jax2tf.py

@@ -1758,7 +1758,7 @@ def _conj(x, **kwargs):
 tf_impl[lax.mul_p] = tf.math.multiply
 
 
-def _iota(*, dtype, shape, dimension, sharding):
+def _iota(*, dtype, shape, dimension, sharding=None):
   dtype = _to_tf_dtype(dtype)
   # Some dtypes are unsupported, like uint32, so we just fall back to int32.
   # TODO(mattjj, necula): improve tf.range dtype handling