nvk: Move cond rendering memory out of gart

This is a 41% performance improvement on the Sascha Willems
conditionalrender demo with all rendering disabled (422 fps -> 595 fps)

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37187>

src/nouveau/vulkan/nvk_cmd_buffer.c

@@ -317,7 +317,7 @@ nvk_cmd_buffer_cond_render_alloc(struct nvk_cmd_buffer *cmd,
    }
 
    struct nvk_cmd_mem *mem;
-   VkResult result = nvk_cmd_buffer_alloc_mem(cmd, true, &mem);
+   VkResult result = nvk_cmd_buffer_alloc_mem(cmd, false, &mem);
    if (unlikely(result != VK_SUCCESS))
       return result;