radv: Don't use a virtual function for getting the buffer virtual address.

We are really not going to use a winsys which does not need to store
the va, so might as well store it in a standard field.

Not sure this helps perf much though, as most of the cost is in the
cache miss accessing the bo anyway, which we stil need to do.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/amd/vulkan/radv_debug.c

@@ -380,7 +380,7 @@ radv_dump_annotated_shader(struct radv_pipeline *pipeline,
 	if (!shader)
 		return;
 
-	start_addr = device->ws->buffer_get_va(shader->bo) + shader->bo_offset;
+	start_addr = radv_buffer_get_va(shader->bo) + shader->bo_offset;
 	end_addr = start_addr + shader->code_size;
 
 	/* See if any wave executes the shader. */