Re-add Android Vulkan tryjob to CQ.
Re-add Android Vulkan tryjob to CQ.

In https://skia-review.googlesource.com/c/skia/+/140344, we removed
Nexus5x jobs from the CQ due to insufficient capacity. This CL re-adds
the NVIDIA_Shield for testing Vulkan on Android. It seems like we have
enough capacity, and most NVIDIA_Shield tasks complete within a few
minutes.

The other removed job was already covered by
Test-Android-Clang-GalaxyS6-GPU-MaliT760-arm64-Release-All-Android.

Change-Id: Ib84bb4d8992856634a5f66900b42cbb413aab6be
Reviewed-on: https://skia-review.googlesource.com/141540
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Auto-Submit: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Reviewed-by: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

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