dt-bindings: arm: fsl: add TQ-Systems boards MBLS1028A and MBLS1028A-IND

Add two mainboards for the TQ-Systems TQMLS1028A SoM, based on the NXP
Layerscape LS1028A.

Signed-off-by: Matthias Schiffer <matthias.schiffer@tq-group.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: tq-schiffern

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -1672,6 +1672,15 @@ properties:
           - const: kontron,sl28
           - const: fsl,ls1028a
 
+      - description:
+          TQ-Systems TQMLS1028A SoM on MBLS1028A/MBLS1028A-IND board
+        items:
+          - enum:
+              - tq,ls1028a-tqmls1028a-mbls1028a
+              - tq,ls1028a-tqmls1028a-mbls1028a-ind
+          - const: tq,ls1028a-tqmls1028a
+          - const: fsl,ls1028a
+
       - description: LS1043A based Boards
         items:
           - enum: