N5X support both HPS handoff data and DDR handoff data. Existing HPS handoff functions are restructured to support both existing devices and N5X device. Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com> Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>