staging/lustre: ATTR_TIMES_SET is always defined, so don't check it

Remove ATTR_TIMES_SET check as it's always present, move
the mask of times define close to where it's used.

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>