Add test for maxVertexInputAttributes
Tests were added to verify that implementations can use as many vertex
input attributes as they advertise.
Existing vertex input tests were modified to never consume more than
one vertex input binding per vertex input attribute.
New tests:
dEQP-VK.pipeline.vertex_input.max_attributes.*
Affects:
dEQP-VK.pipeline.vertex_input.single_attribute.*
dEQP-VK.pipeline.vertex_input.multiple_attributes.*
Components: Vulkan
VK-GL-CTS issue: 261
Change-Id: I3a481618e700ccda8caa4ea00426be14867a58e5