Allow quant layer to be unfrozen (#2142)

python/mlx/nn/layers/quantized.py

@@ -193,12 +193,6 @@ class QuantizedLinear(Module):
         # Freeze this model's parameters
         self.freeze()
 
-    def unfreeze(self, *args, **kwargs):
-        """Wrap unfreeze so that we unfreeze any layers we might contain but
-        our parameters will remain frozen."""
-        super().unfreeze(*args, **kwargs)
-        self.freeze(recurse=False)
-
     def _extra_repr(self):
         out_dims, in_dims = self.weight.shape
         in_dims *= 32 // self.bits