Btrfs: unplug all devices in the unplug call back

For larger multi-device filesystems, there was logic to limit the
number of devices unplugged to just the page that was sent to our sync_page
function.

But, the code wasn't always unplugging the right device.  Since this was
just an optimization, disable it for now.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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