My changes to _tlbie to fix 4xx unfortunately broke 8xx build in a
couple of places.  This fixes it.

Spotted by Olof Johansson.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NVitaly Bordug <vitb@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>