This patch adds the IOC signal identities and signal group identities, that will be used by subsequent signal support patches. Signed-off-by: Liu Yuan <yuan1.liu@intel.com> Reviewed-by: Wang Yu <yu1.wang@intel.com> Reviewed-by: Liu Shuo <shuo.a.liu@intel.com> Reviewed-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>