Add tests for VK_EXT_subgroup_size_control

Add tests for VK_EXT_subgroup_size_control

For compute and graphics pipelines:

* Check the required subgroup size set by the tests is honored by the
  driver (including for full subgroups and allow varying cases for
  computer shaders).
* Check that enabling allow varying subgroup size reports a subgroup
  size that falls within the limits of the driver.
* For compute pipeline, check that require full subgroups works as
  expected.

On top of that, added requiredSubgroupSize case for subgroup's compute
shader tests that check all possible required subgroup sizes announced
by the driver.

Also there is a test that checks subgroup size control limits sanity.

Added tests:

  dEQP-VK.subgroups.size_control.*
  dEQP-VK.subgroups.*.compute*_requiredsubgroupsize

Affected tests:

  dEQP-VK.subgroups.*

Components: Vulkan
VK-GL-CTS issue: 1864

Change-Id: Ia48deb9318420889754bd97545045f85b3c6fed7