OvmfPkg/*.dsc: Change FileHandleLib instance path

This library instance was renamed from BaseFileHandleLib
to UefiFileHandleLib in r11421.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11492 6f19259b-4bc3-4df7-8a09-765794883524
3 files changed