anv: Use an actual binding for gl_NumWorkgroups

This commit moves our handling of gl_NumWorkgroups over to work like our
handling of other special bindings in the Vulkan driver.  We give it a
magic descriptor set number and teach emit_binding_tables to handle it.
This is better than the bias mechanism we were using because it allows
us to do proper accounting through the bind map mechanism.

Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>

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