md: Flush workqueue md_rdev_misc_wq in md_alloc()

A race condition still exists when removing and re-creating md devices
in test cases. However, it is only seen on some setups.

The race condition was tracked down to a reference still being held
to the kobject by the rdev in the md_rdev_misc_wq which will be released
in rdev_delayed_delete().

md_alloc() waits for previous deletions by waiting on the md_misc_wq,
but the md_rdev_misc_wq may still be holding a reference to a recently
removed device.

To fix this, also flush the md_rdev_misc_wq in md_alloc().

Signed-off-by: David Sloan <[email protected]>
[[email protected]: rewrote commit message]
Signed-off-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Song Liu <[email protected]>

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