One: Compiler FE: Enable ReLU6 Op

[binarman]

For Issue : #1606

• [x] res/TensorFlowPythonExamples done before
• [x] tflchef done before
• [x] tflite2circle nothing to do, no options to convert
• [x] tfldump nothing to do
• [x] circledump nothing to do
• [x] res/TensorFlowLiteRecipes done before
• [x] luci.IR done before
• [x] luci.Import #2786
• [x] luci.Export done before
• [x] luci.logex done before
• [x] luci.Service done before
• [x] luci.tests #2786

[binarman]

Actually only importer left for this operator :slightly_smiling_face:

[binarman]

I would like to proceed without draft, because we changing only one component anyway.

[binarman]

done, closing