dt-bindings: display: Add dsi-controller.yaml in DSI controller schemas

Some DSI controllers are missing a reference to the recently added
dsi-controller.yaml schema. Add it and we can drop the duplicate parts.

Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: Philippe Cornu <philippe.cornu@st.com>
Cc: Yannick Fertre <yannick.fertre@st.com>
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20201002225924.3513700-1-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/st,stm32-dsi.yaml

@@ -13,6 +13,9 @@ maintainers:
 description:
   The STMicroelectronics STM32 DSI controller uses the Synopsys DesignWare MIPI-DSI host controller.
 
+allOf:
+  - $ref: dsi-controller.yaml#
+
 properties:
   compatible:
     const: st,stm32-dsi
@@ -65,24 +68,6 @@ properties:
         description:
           DSI output port node, connected to a panel or a bridge input port"
 
-patternProperties:
-  "^(panel|panel-dsi)@[0-9]$":
-    type: object
-    description:
-      A node containing the panel or bridge description as documented in
-      Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
-    properties:
-      port:
-        type: object
-        description:
-          Panel or bridge port node, connected to the DSI output port (port@1)
-
-  "#address-cells":
-    const: 1
-
-  "#size-cells":
-    const: 0
-
 required:
   - "#address-cells"
   - "#size-cells"
@@ -92,7 +77,7 @@ required:
   - clock-names
   - ports
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |