Discontinue maintenance and active support of ArmNN on Pixel phones.
This reverts commit 4564ee58a4.
Reason for revert: resubmitting again together with a fix for the broken test
Bug: 294459623
Change-Id: I4635c49836dd0e5716308ed0184b14954ccdbd6b
Test: Local nnapi_info
Test: Presubmit