Narrow down some Adreno opt-outs to GLSL only.

Several failing Adreno tests pass in Vulkan but fail in GLSL.
(Unfortunately, some tests do fail across the board.) We can increase
our scope of testing by limiting our test disables to only the backends
where failures actually occur.

Change-Id: I9374cb98a7062db58a5470d0ed2bd02105f02f04
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/441888
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed