vk/device: Be consistent about path to DRM device
vk/device: Be consistent about path to DRM device

Function fill_physical_device() has a 'path' parameter, and struct
anv_physical_device has a 'path' member. Sometimes these are used;
sometimes hardcoded "/dev/dri/renderD128" is used instead.

Be consistent. Hardcode "/dev/dri/renderD128" in exactly one location,
during initialization of the physical device.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler