Now that caller already suspend the array, there is no need to suspend
array in liner_add().

Note that mddev_suspend/resume() is not used anymore.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231010151958.145896-16-yukuai1@huaweicloud.com