MdePkg/MdePkg.dec: Update PciSegmentLib.h to S3PciSegmentLib.h
S3PciSegmentLib library class header file should be
Include/Library/S3PciSegmentLib.h instead of
Include/Library/PciSegmentLib.h.
https://bugzilla.tianocore.org/show_bug.cgi?id=2146
Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <liming.gao@intel.com> Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>