PciBusDxe: duplicate node insertion for every PPB device in the system

PciBusDxe: duplicate node insertion for every PPB device in the system

https://bugzilla.tianocore.org/show_bug.cgi?id=1796
Bug fixed in PciBusDxe\PciLib.c.
Removed the redundant second call to PciSearchDevice sub-routine when the
PCD for the Hot-Plug support is disabled.

Signed-off-by: Ashraf Javeed <Ashraf.javeed@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Acked-by: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Ray Ni <ray.ni@intel.com>