dt-bindings: mfd: sl28cpld: Drop sa67mcu compatible

I was just informed that this product is discontinued (without being
ever released to the market). Pull the plug and let's not waste any more
maintainers time and revert commit a598ae4 ("dt-bindings: mfd:
sl28cpld: Add sa67mcu compatible").

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michael Walle <mwalle@kernel.org>
Link: https://patch.msgid.link/20260302122540.1377444-4-mwalle@kernel.org
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: mwalle

Documentation/devicetree/bindings/embedded-controller/kontron,sl28cpld.yaml

@@ -16,12 +16,7 @@ description: |
 
 properties:
   compatible:
-    oneOf:
-      - items:
-          - enum:
-              - kontron,sa67mcu
-          - const: kontron,sl28cpld
-      - const: kontron,sl28cpld
+    const: kontron,sl28cpld
 
   reg:
     description: