Disable SkSLMatrixToVectorCast test on Adreno 4/5/6xx.

The `ivec4(mat2)` case appears to throw Adreno 600 for a loop.

Change-Id: If703e6ae28a2214a00e54f5816563729b6f94d8d
Bug: skia:12192
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/426957
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2 files changed