md/raid10: fix incorrect done of recovery

hulk inclusion
category: bugfix
bugzilla: 188535, https://gitee.com/openeuler/kernel/issues/I6O61Q


CVE: NA

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Recovery will go to giveup and let chunks_skipped++ in raid10_sync_request
if there are some bad_blocks, and it will return max_sector when
chunks_skipped >= geo.raid_disks. Now, recovery fail and data is
inconsistent but user think recovery is done, it is wrong.

Fix it by set mirror's recovery_disabled and spare device shouln't be
added to here.

Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Hou Tao <houtao1@huawei.com>