dt-bindings: arm: imx: Add the i.MX7D-SDB Rev-A board

Add board binding for i.MX7D-SDB Rev-A board which is already
supported.
Signed-off-by: NAnson Huang <Anson.Huang@nxp.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -240,6 +240,7 @@ properties:
         items:
           - enum:
               - fsl,imx7d-sdb             # i.MX7 SabreSD Board
+              - fsl,imx7d-sdb-reva        # i.MX7 SabreSD Rev-A Board
               - novtech,imx7d-meerkat96   # i.MX7 Meerkat96 Board
               - toradex,colibri-imx7d                   # Colibri iMX7 Dual Module
               - toradex,colibri-imx7d-emmc              # Colibri iMX7 Dual 1GB (eMMC) Module