TI Keystone DWC3 compatible DT node is supposed to have a DWC USB3^^^ its?
compatible sub-node to describe a fully functioning USB interface.
Since DWC USB3 has now got a DT schema describing it' DT node, let's make
sure the TI Keystone DWC3 sub-node passes validation against it.[...]
Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>