Add testing for sparse D/S/DS images.

Add testing for sparse D/S/DS images.

Add sparse binding support for shadow texture tests by supporting sparse
binding in texture test util class. Removed unnecessary image aspect
check which prevented shadow sampler testing with sparse images.

Affects:

dEQP-VK.glsl.texture_functions.texture.sparse*shadow*
dEQP-VK.glsl.texture_gather.*depth32f*sparse*
dEQP-VK.texture.shadow.*sparse*

Components: Vulkan

VK-GL-CTS issue: 79

Change-Id: I265f09817493d96b91450f71822b00434bcf6cf3