maintenance4: Add push-constant test

maintenance4: Add push-constant test

Test creates a pipeline with a push-constant, but not initialize
that push constant. The test runs without crashing when reading
that undefined value.

Components: Vulkan

VK-GL-CTS issue: 2996

Affets:
dEQP-VK.pipeline.push_constant.compute_pipeline.*

Change-Id: I0ca1d4082daccd628e26936b4b0b17550c698a1e