Declare the TYPE_BONITO_PCI_HOST_BRIDGE QOM type in a
header to be able to access it from board code.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230105130710.49264-8-philmd@linaro.org>