driconf: force the vendor string to NVIDIA to fix viewperf energy tests

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <!7031>

src/util/00-mesa-defaults.conf

@@ -287,6 +287,10 @@ TODO: document the other workarounds.
             <option name="allow_glsl_extension_directive_midshader" value="true" />
             <option name="allow_glsl_120_subset_in_110" value="true" />
             <option name="force_gl_names_reuse" value="true" />
+            <!-- This makes it use GL_NVX_gpu_memory_info to query memory info
+                 instead of non-existent GLX_AMD_gpu_association. Yes, it checks
+                 the vendor string, not the extension list. -->
+            <option name="force_gl_vendor" value="NVIDIA Corporation" />
         </application>
 
         <!-- The GL thread allowlist is below, workarounds are above.