Test VkSubresourceLayout::offset is relative to the start of an image

Test VkSubresourceLayout::offset is relative to the start of an image

This commit adds new tests that verify VkSubresourceLayout includes
the right value for an offset if an image is bound with the offset.

VK-GL-CTS Issue: 3552

New tests:
dEQP-VK.ycbcr.subresource_offset.*
dEQP-VK.image.subresource_layout.*_offset

Components: Vulkan

Change-Id: Iefaa1a6e0266f8dd599abace0b5f6bb6617fe4af