OvmfPkg: resolve OrderedCollectionLib with base red-black tree instance

OvmfPkg: resolve OrderedCollectionLib with base red-black tree instance

The "complete" QEMU fw_cfg ACPI loader will need to look up downloaded
blobs by name, in order to implement the AddPointer and AddChecksum
commands. Introduce OrderedCollectionLib to support such indexing.

BaseOrderedCollectionRedBlackTreeLib is a BASE module, hence add the
OrderedCollectionLib resolution to the main [LibraryClasses] section.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16155 6f19259b-4bc3-4df7-8a09-765794883524