layers: Add coverage for swapchain creation valid usage clause 01778

[mikes-lunarg]

@drakos-amd I rebased moved this commit over from the gitlab repo for more exposure

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[tobine]

CI Blowing up:

/home/travis/build/KhronosGroup/Vulkan-ValidationLayers/layers/core_validation.cpp:12216:30: error: ‘VK_SWAPCHAIN_CREATE_MUTABLE_FORMAT_BIT_KHR’ was not declared in this scope if (pCreateInfo->flags & VK_SWAPCHAIN_CREATE_MUTABLE_FORMAT_BIT_KHR)

[mikes-lunarg]

Whoops, I seemed to have jumped the gun on this one. It isn't in the header yet: KhronosGroup/Vulkan-Docs#853