flatcar-install: make sure blkid returns one device
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In some cases where path disk devices have multiple copies, `blkid` should return only one device for label. According to https://linux.die.net/man/8/blkid, the `-l` would be perfect for this, as it returns the regular block device first. Fixes: flatcar/Flatcar#1506
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In some cases where path disk devices have multiple copies,
blkidshould return only one device for label.According to https://linux.die.net/man/8/blkid, the
-lwould be perfect for this, as it returns the regular block device first.Fixes: flatcar/Flatcar#1506