Staging: lustre: Make lustre_profile_list static

Variable lustre_profile_list is only used inside obd_config.c,
better make it static

Signed-off-by: Iban Rodriguez <iban.rodriguez@ono.com>
Acked-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>