staging/lustre/lov: remove a bit of dead code

lov_stripe_md_cmp lov_lum_lsm_cmp lov_lum_swab_if_needed functions
have not been in used for a long time, so lets just remove them.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>