dEQP-VK.renderpass.sparserendertarget: bind metadata

dEQP-VK.renderpass.sparserendertarget: bind metadata

Memory was not bound to METADATA aspect, when COLOR aspect
mip tail size was 0. METADATA requirements are not related
to mip tails in other aspects - memory must be always and
unconditionally bound to METADATA.

Additionally, change VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT
condition to layerNdx == 0, as imageMipTailMemoryBinds vector
is now used both for metadata and other mip tails.

Affects: dEQP-VK.renderpass.sparserendertarget.*

Components: Vulkan

VK-GL-CTS issue: 958

Change-Id: I34661c82e0d9829448ac85546055c72151bfe85e