Upgrade hexagon docker image to 0.2  (#1033)
Upgrade hexagon docker image to 0.2  (#1033)

* Upgrade hexagon docker image to 0.2 and enable unit test for hexagon in presubmit

Upgrade hexagon docker image to 0.2 and enable unit test for hexagon in presubmit.
Two brittle tests are temporarily disabled.

BUG=https://b/227665919

* Have to update the docker version in workflow first
tensorflow/tflite-micro,tensorflow/tflite-micro,tensorflow/tflite-micro,tensorflow/tflite-micro