Complete function header, detailed description, ASSERT()s & pass smoke test in MRC of Lakeport package by replacing Smbus PPI.
*Device Patch Lib
Fix a bug in AppendDevicePathNode() (Solve Track #44 in Remodel PVCS). The original logic failed if the first device path was NULL.
*Performance Lib
Add PeiPerformanceHob & Performance protocol in spd file in EdkModule Package (Solve Tracker #41, #42 in Remodel PVCS).
*Hob Lib
Add detailed description for each Hob function.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@126 6f19259b-4bc3-4df7-8a09-765794883524
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