dt-bindings: arm: fsl: add TQ Systems boards based on i.MX6UL(L)

TQMa6ULx is a SOM family using NXP i.MX6UL CPU family.
TQMa6ULLx is a SOM family using NXP i.MX6ULL CPU family.
Both are available as a socket type as well as an LGA type.
For both variants there are the mainboards MBa6ULx and MBa6ULxL, trailing
'L' is LGA version.
Finally there is the possibility to use the socket module with an LGA
adapter on the MBa6ULxL.

The SOM needs a mainboard, therefore we provide compatibles using this
naming schema:

"tq,imx6ul-<SOM>" for the module and
"tq,imx6ul-<SOM>-<SBC>" for when mounted on the mainboard.
The i.MX6ULL version is done similar.
Signed-off-by: Matthias Schiffer <matthias.schiffer@tq-group.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/arm/fsl.yaml

@@ -613,6 +613,28 @@ properties:
           - const: kontron,imx6ul-n6310-som
           - const: fsl,imx6ul
 
+      - description: TQ-Systems TQMa6UL1 SoM on MBa6ULx board
+        items:
+          - enum:
+              - tq,imx6ul-tqma6ul1-mba6ulx
+          - const: tq,imx6ul-tqma6ul1      # MCIMX6G1
+          - const: fsl,imx6ul
+
+      - description: TQ-Systems TQMa6UL2 SoM on MBa6ULx board
+        items:
+          - enum:
+              - tq,imx6ul-tqma6ul2-mba6ulx
+          - const: tq,imx6ul-tqma6ul2      # MCIMX6G2
+          - const: fsl,imx6ul
+
+      - description: TQ-Systems TQMa6ULxL SoM on MBa6ULx[L] board
+        items:
+          - enum:
+              - tq,imx6ul-tqma6ul2l-mba6ulx # using LGA adapter
+              - tq,imx6ul-tqma6ul2l-mba6ulxl
+          - const: tq,imx6ul-tqma6ul2l      # MCIMX6G2, LGA SoM variant
+          - const: fsl,imx6ul
+
       - description: i.MX6ULL based Boards
         items:
           - enum:
@@ -667,6 +689,21 @@ properties:
           - const: kontron,imx6ull-n6411-som
           - const: fsl,imx6ull
 
+      - description: TQ Systems TQMa6ULLx SoM on MBa6ULx board
+        items:
+          - enum:
+              - tq,imx6ull-tqma6ull2-mba6ulx
+          - const: tq,imx6ull-tqma6ull2      # MCIMX6Y2
+          - const: fsl,imx6ull
+
+      - description: TQ Systems TQMa6ULLxL SoM on MBa6ULx[L] board
+        items:
+          - enum:
+              - tq,imx6ull-tqma6ull2l-mba6ulx # using LGA adapter
+              - tq,imx6ull-tqma6ull2l-mba6ulxl
+          - const: tq,imx6ull-tqma6ull2l      # MCIMX6Y2, LGA SoM variant
+          - const: fsl,imx6ull
+
       - description: i.MX6ULZ based Boards
         items:
           - enum: