dt-bindings: arm: keystone: Remove ti,system-reboot-controller property

This property was only ever used in one device. It is no longer needed as
what it signaled is now default. Remove this unneeded/unused property.
Signed-off-by: Andrew Davis <afd@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240326223730.54639-5-afd@ti.comSigned-off-by: Nishanth Menon <nm@ti.com>

Documentation/devicetree/bindings/arm/keystone/ti,sci.yaml

@@ -61,10 +61,6 @@ properties:
   mboxes:
     minItems: 2
 
-  ti,system-reboot-controller:
-    description: Determines If system reboot can be triggered by SoC reboot
-    type: boolean
-
   ti,host-id:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: |
@@ -94,7 +90,6 @@ examples:
   - |
     pmmc: system-controller@2921800 {
       compatible = "ti,k2g-sci";
-      ti,system-reboot-controller;
       mbox-names = "rx", "tx";
       mboxes = <&msgmgr 5 2>,
                <&msgmgr 0 0>;