dt-bindings: net: broadcom-bluetooth: Add CYW55572 DT binding

CYW55572 is a Wi-Fi + Bluetooth combo device from Infineon.
Extend the binding with its DT compatible.

Signed-off-by: Hakan Jansson <hakan.jansson@infineon.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>