Remove invalid atomic image compare swap tests from mustpass.

Atomic compare swap image return value test verification is wrong. Tests pass
only if all the operations on single texel are run sequentially.

Affected tests:
dEQP-GLES31.functional.image_load_store.*.atomic.comp_swap_*_return_value

Bug: 19641084
Change-Id: I9b003d565ae90e12220c0df2c8927095703de4a6
2 files changed