anv: Don't disable snooping for mempools
anv: Don't disable snooping for mempools

There's an intermittent flushing problem with VkEvent that we need to
root cause. For now, using the snooping feature keeps the memory pools
up to date with GPU writes and fixes the problem.

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler