EmbeddedPkg: add base DtPlatformDtbLoaderLib implementation Introduce an implementation of the new DtPlatformDtbLoaderLib library class that simply retrieves the first raw section of an FV file named 'gDtPlatformDefaultDtbFileGuid'. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <[email protected]> Reviewed-by: Laszlo Ersek <[email protected]>