driver core: separate function to shutdown one device

Make a separate function for the part of device_shutdown() that does the
shutown for a single device.  This is in preparation for making device
shutdown asynchronous.

Signed-off-by: Stuart Hayes <[email protected]>
Signed-off-by: David Jeffery <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: Keith Busch <[email protected]>
Tested-by: Keith Busch <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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