message: Fix some tflite op quantization spec
  Some of the ops are missing int16
diff: @@ -550,14 +550,14 @@ def TFL_ConcatenationOp : TFL_Op<"concatenation",
  let arguments = (
  ins Variadic<TensorOf<
  - [F32, I64, I32, I16, I8, QI8, QUI8, TFL_Uint8]>>:$values,
  + [F32, I64, I32, I16, I8, QI8, QUI8, QI16, TFL_Uint8]>>:$values,
  I32Attr:$axis,
  TFL_AFAttr:$fused_activation_function
  );
  let results = (outs
  TensorOf<
  - [F32, I64, I32, I16, I8, QI8, QUI8, TFL_Uint8]>:$output
  + [F32, I64, I32, I16, I8, QI8, QUI8, QI16, TFL_Uint8]>:$output
  );
  let hasOptions = 1;
  @@ -2658,12 +2658,12 @@ def TFL_SplitOp : TFL_Op<"split", [
  let arguments = (ins
  TensorOf<[I32]>:$split_dim,
  - TensorOf<[F32, I16, I32, I64, QI8, QUI8]>:$value,
  + TensorOf<[F32, I16, I32, I64, QI8, QUI8, QI16]>:$value,
  PositiveI32Attr:$num_splits
  );
  let results = (outs
  - Variadic<TensorOf<[F32, I16, I32, I64, QI8, QUI8]>>:$outputs
  + Variadic<TensorOf<[F32, I16, I32, I64, QI8, QUI8, QI16]>>:$outputs
  );
  let verifier = [{ return Verify(*this); }];
  @@ -2681,14 +2681,14 @@ def TFL_SplitVOp : TFL_Op<"split_v", [NoSideEffect, SameOperandsAndResultsScale]
  }];
  let arguments = (ins
  - TensorOf<[F32, I16, I32, I64, QI8, QUI8]>:$value,
  + TensorOf<[F32, I16, I32, I64, QI8, QUI8, QI16]>:$value,
  1DTensorOf<[I32]>:$size_splits,
  0DTensorOf<[I32]>:$split_dim,
  PositiveI32Attr:$num_splits
  );
  let results = (outs
  - Variadic<TensorOf<[F32, I16, I32, I64, QI8, QUI8]>>:$outputs
  + Variadic<TensorOf<[F32, I16, I32, I64, QI8, QUI8, QI16]>>:$outputs
  );
  let verifier = [{ return Verify(*this); }];
  