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Since `9ec5a8a layer.conf: Drop sumo from LAYERSERIES_CORENAMES' and
`9867924 layer.conf: Add thud to LAYERSERIES_CORENAMES' applied in oe-core,
add thud to LAYERSERIES_COMPAT
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>