message: Update hexagon_delegate guide to reference delegate readme
diff: @@ -259,43 +259,7 @@ ro.board.platform`).
  * This is tentatively planned for a future release, though there is no
  concrete timeline.
  * Which ops are supported by the delegate?
  - * Initial list of supported ops:
  - * Add
  - * ArgMax
  - * ArgMin
  - * AveragePool2D (without any activation)
  - * Concat
  - * Conv2D with following constraints:
  - * stride width/height <= 3
  - * DepthToSpace
  - * DepthwiseConv2D with following constraints:
  - * Filter width == 3
  - * depth_multiplier == 1
  - * dilation only supported when stride == 1
  - * Otherwise, stride height/width <= 3
  - * FullyConnected (without any activation)
  - * Hardswish
  - * L2Normalization (without any activation)
  - * Logistic (aka Sigmoid)
  - * MaxPool2D (without any activation)
  - * Mul (without any activation)
  - * Neg
  - * Pad: Only supports 0 padding
  - * Relu
  - * Relu6
  - * Reshape
  - * Resize Bilinear with following constraints:
  - * Requested size <= 65
  - * Resize Nearest Neighbor
  - * SoftMax
  - * SpaceToDepth
  - * Split
  - * Sub
  - * Tanh
  - * Transpose
  - * TransposeConv2D with following constraints:
  - * stride height/width <= 3
  - * dilation height/width == 1
  + * See the current list of [supported ops and constraints](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/lite/experimental/delegates/hexagon/README.md)
  * How can I tell that the model is using the DSP when I enable the delegate?
  * Two log messages will be printed when you enable the delegate - one to
  indicate if the delegate was created and another to indicate how many
  