Add macro EMU_VARIABLE_ENABLE and DISABLE_RESET_SYSTEM to include or exclude some drivers from Payload Cc: Maurice Ma <maurice.ma@intel.com> Cc: Guo Dong <guo.dong@intel.com> Cc: Benjamin You <benjamin.you@intel.com> Reviewed-by: Guo Dong <guo.dong@intel.com> Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>