Test pSetLayouts in graphics_pipeline_library

Test pSetLayouts in graphics_pipeline_library

VK_EXT_graphics_pipeline_library allows the entrys in
VkPipelineLayoutCreateInfo::pSetLayouts to be nullptr if
VK_PIPELINE_LAYOUT_CREATE_INDEPENDENT_SETS_BIT_EXT is set.
This change adds test that use nullptrs in various combinations
of pSetLayouts.

Components: Vulkan

VK-GL-CTS issue: 3567

Affects:
dEQP-VK.pipeline.pipeline_library.graphics_library.misc.*

New tests:
dEQP-VK.pipeline.pipeline_library.graphics_library.misc.bind_null_descriptor_set.*

Change-Id: I3d8958a1e234e4d47e4f65d31c09fe3f4ddb3b54