We adjusted the BO flags for USWC handling, but those never took effect
because the placement was passed in instead of generated inside this
function.

v2: better commit message
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>