anv: fix some multisample line_wide CTS tests
After spending some time trying to understand how line rasterization and multisampling work, I am convinced that I know even less now than I did before.
Brute forcing my way through it, I found that the respective tests pass if we set DXMultisampleRasterizationEnable to false, but that then breaks a bunch of other tests under dEQP-VK.pipeline.multisample.*. A compromise is reached by setting this bit based on the requested line width, and since this doesn't seem to be breaking anything else that I noticed, I'm happy to pretend it's a success.
Closes #2833 Fixes dEQP-VK.rasterization.interpolation_multisample_*_bit.*lines_wide