dt-bindings: Add compatible for LS2088A QDS and RDB board

Signed-off-by: Abhimanyu Saini <abhimanyu.saini@nxp.com>
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Signed-off-by: Ashish Kumar <ashish.kumar@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>