Add a few more definitions and make SbiCall and TranslateError usable (not static) by library users. Cc: Daniel Schaefer <git@danielschaefer.me> Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>