Revert "Turn on vk unit tests"

This reverts commit aa3e498b.

Reason for revert: Synchronization with WebView is hard.
Also:
* All currently shipping devices that turn Vulkan on for HWUI support at
  least two graphics queues, with the exception of emulators using
  swiftshader.
* Using two graphics queues doesn't significantly regress RAM on those
  devices

Bug: 280564832
Test: DailyMail app
Change-Id: Ica0c461af9df771292967ed10df63b2aa6902ae3