Sync patch r14733 from main trunk.
Fix the BdsExpandPartitionPartialDevicePathToFull() hang issue by duplicates BlockIoDevicePath when the CachedDevicePath returned from BdsLibDelPartMatchInstance() is NULL.

git-svn-id: https://svn.code.sf.net/p/edk2/code/branches/UDK2010.SR1@14734 6f19259b-4bc3-4df7-8a09-765794883524