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When PcdPciDisableBusEnumeration is enabled, the PciBus driver might get into a dead loop if the secondary bus register on PCI bridge is not programmed or programmed improperly. Adding this check to avoid any potential dead loop caused by this. Cc: Feng Tian <feng.tian@intel.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Maurice Ma <maurice.ma@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> Reviewed-by: Lee Leahy <Leroy.p.leahy@intel.com>