Portability: use triangle strips in amber tests

Portability: use triangle strips in amber tests

Triangle fans are under feature flag in VK_KHR_portability_subset.
This was handled in CTS but since then some new tests were added
with triangle fans. This change converts triangle fans to triangle
strips in all cases that failed for that reason on MacOS. Those
tests didn't test triangle fans and could be modified.

See:
https://github.com/KhronosGroup/MoltenVK/issues/1285

Components: Vulkan

Affects:
dEQP-VK.draw.output_location.*
dEQP-VK.rasterization.depth_bias.*

Change-Id: Ia108c40d1e9cfeb3669de4192f6df95b26c5a50f