Add new build type provides for enclave

Add a provides tag (read by the open buildservice) for the new
enclave builder. Also add a recommends to eif_builder in
the systemdeps-core meta package

package/python-kiwi-spec-template

@@ -121,12 +121,14 @@ Provides:       kiwi-image-tbz-requires = %{version}-%{release}
 Obsoletes:      kiwi-image-tbz-requires < %{version}-%{release}
 %if "%{_vendor}" != "debbuild"
 Provides:       kiwi-image:tbz
+Provides:       kiwi-image:enclave
 %endif
 # tools conditionally used by kiwi
 %if 0%{?fedora} || 0%{?rhel} >= 8
 Recommends:     gnupg2
 Recommends:     apt
 Recommends:     dpkg
+Recommends:     eif_build
 %endif
 %if 0%{?suse_version}
 Recommends:     gpg2