radv: force enable VK_AMD_shader_ballot for Wolfenstein Youngblood

This gives a nice boost, +20% at this time on my Vega 56. Shader
ballot should be enabled by default at some point but it reduces
performance a bit (-6%) with Wolfeinstein II. Enable it only for
Youngblood at the moment, like what we did for Talos in the past.

As a bonus point, it gets rid of some minor artifacts that only
happens when ballot is disabled for some reasons.

Cc: 19.2 <[email protected]
Signed-off-by: Samuel Pitoiset <[email protected]>
Reviewed-by: Bas Nieuwenhuizen <[email protected]>

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