md: don't clear MD_RECOVERY_FROZEN for new dm-raid until resume

After commit 9dbd1aa3a81c ("dm raid: add reshaping support to the
target") raid_ctr() will set MD_RECOVERY_FROZEN before md_run() and
expect to keep array frozen until resume. However, md_run() will clear
the flag by setting mddev->recovery to 0.

Before commit 1baae052cccd ("md: Don't ignore suspended array in
md_check_recovery()"), dm-raid actually relied on suspending to prevent
starting new sync_thread.

Fix this problem by keeping 'MD_RECOVERY_FROZEN' for dm-raid in
md_run().

Fixes: 1baae052cccd ("md: Don't ignore suspended array in md_check_recovery()")
Fixes: 9dbd1aa3a81c ("dm raid: add reshaping support to the target")
Cc: [email protected] # v6.7+
Signed-off-by: Yu Kuai <[email protected]>
Signed-off-by: Xiao Ni <[email protected]>
Acked-by: Mike Snitzer <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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