fs/reiserfs: remove unused macros

these macros are never used from introduced. better to
remove them.

Link: https://lore.kernel.org/r/1579602338-57079-1-git-send-email-alex.shi@linux.alibaba.com


Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Bharath Vedartham <linux.bhar@gmail.com>
Cc: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: zhengbin <zhengbin13@huawei.com>
Cc: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: reiserfs-devel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>