dt-bindings: bus: Document Broadcom GISB arbiter 74165 compatible

The 74165 chip introduces a new layout for the GISB arbiter which is not
identical to previous chips, document the new compatible that we are
going to key off.

Link: https://lore.kernel.org/r/20240111231539.783785-2-florian.fainelli@broadcom.comSigned-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/bus/brcm,gisb-arb.yaml

@@ -18,6 +18,7 @@ properties:
           - const: brcm,gisb-arb
       - items:
           - enum:
+              - brcm,bcm74165-gisb-arb  # for V7 new style 16nm chips
               - brcm,bcm7278-gisb-arb  # for V7 28nm chips
               - brcm,bcm7435-gisb-arb  # for newer 40nm chips
               - brcm,bcm7400-gisb-arb  # for older 40nm chips and all 65nm chips