fscrypt: Use constant protector name
fscrypt: Use constant protector name

Use constant protector name 'ceph-csi' instead of constant prefix
concatenated with the volume ID. When cloning volumes the ID changes
and fscrypt protected directories become inunlockable due to the
protector name change

Signed-off-by: Marcel Lauhoff <71ffe8e889bf8a669a25bf46f8e88e7fab585e83@suse.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi