dt-bindings: arm: ti: Drop Kontron SMARC-sAM67 module

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 22e1d0d ("dt-bindings: arm: ti:
Add Kontron SMARC-sAM67 module").

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michael Walle <mwalle@kernel.org>
Link: https://patch.msgid.link/20260302122540.1377444-5-mwalle@kernel.org
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: mwalle

Documentation/devicetree/bindings/arm/ti/k3.yaml

@@ -208,7 +208,6 @@ properties:
         items:
           - enum:
               - beagle,am67a-beagley-ai
-              - kontron,sa67             # Kontron SMARC-sAM67 board
               - ti,j722s-evm
           - const: ti,j722s