vrend: disable GL_EXT_external_object_fd path on non-Intel boards

When running some traces, we see the following on AMD.

file:dmabuf fault:ttm_bo_vm_fault mmap:dma_buf_mmap_internal readpage:0x0

Disable for now.

Reviewed-By: David Riley <davidriley@chromium.org>

src/vrend_renderer.c

@@ -10096,8 +10096,10 @@ static void vrend_renderer_fill_caps_v2(int gl_ver, int gles_ver,  union virgl_c
    }
 
 #ifdef ENABLE_MINIGBM_ALLOCATION
-   if (has_feature(feat_memory_object) && has_feature(feat_memory_object_fd))
-      caps->v2.capability_bits |= VIRGL_CAP_ARB_BUFFER_STORAGE;
+   if (has_feature(feat_memory_object) && has_feature(feat_memory_object_fd)) {
+         if (!strcmp(gbm_device_get_backend_name(gbm->device), "i915"))
+            caps->v2.capability_bits |= VIRGL_CAP_ARB_BUFFER_STORAGE;
+   }
 #endif
 
    if (has_feature(feat_blend_equation_advanced))