dt-bindings: mfd: syscon: Add ti,am654-dss-oldi-io-ctrl compatible

Add TI DSS OLDI-IO control registers compatible. This is a region of 5
32bit registers found in the TI AM65 CTRL_MMR0 register space[0]. They
are used to control the characteristics of the OLDI DATA/CLK IO as needed
by the DSS display controller node.

[0] https://www.ti.com/lit/pdf/spruid7Signed-off-by: Andrew Davis <afd@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Aradhya Bhatia <a-bhatia1@ti.com>
Link: https://lore.kernel.org/r/20230911142556.64108-1-afd@ti.comSigned-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -70,6 +70,7 @@ properties:
               - rockchip,rk3588-qos
               - rockchip,rv1126-qos
               - starfive,jh7100-sysmain
+              - ti,am654-dss-oldi-io-ctrl
 
           - const: syscon