drm/amdgpu: ignore duplicate BOs again

Looks like RADV is actually hitting this.

Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: ca6c1e21 ("drm/amdgpu: use the new drm_exec object for CS v3")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231017121015.1336786-1-christian.koenig@amd.com