MdePkg UefiPciLibPciRootBridgeIo: Remove redundant dependency
MdePkg UefiPciLibPciRootBridgeIo: Remove redundant dependency

PiDxe.h is not used PciSegmentLib.h.
So <PiDxe.h> is deleted.
https://bugzilla.tianocore.org/show_bug.cgi?id=1184

v2:Update the bugzilla link.

Cc: Michael D Kinney <fd20bc543a9f65bb633fac7d08a403c1f1c8eb6c@intel.com>
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: shenglei <bc08ecbbf1316cc766ca5aae38ff0e194af9f1cf@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>

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