Only use AABBs for the shader record tests

Only use AABBs for the shader record tests

AABBS_AND_TRIANGLES uses the instanceSBTOffset to pick between shader hit
groups, but the test only defines one shader hit group. Just using AABBs
still exercises all shaders but fits the shader groups defined by the test.

Affects: dEQP-VK.ray_tracing_pipeline.misc.shaderRecord*

Components: Vulkan
VK-GL-CTS issue: 2444

Change-Id: Ic718c22e9ef4176763179b084019a3a83ed7c584
(cherry picked from commit 11b863aca0d3eb09a1d9ebd8e91c3c310578220e)