ceph-volume: fix dmcrypt activation regression

`ceph.with_tpm` tag is actually a `str`, which means that
`bool('0')` will return `True`.

Fixes: https://tracker.ceph.com/issues/68944

Signed-off-by: Guillaume Abrioux <[email protected]>

Author: guits

src/ceph-volume/ceph_volume/objectstore/lvmbluestore.py

@@ -367,7 +367,7 @@ def _activate(self,
         if is_encrypted:
             osd_lv_path = '/dev/mapper/%s' % osd_block_lv.__dict__['lv_uuid']
             lockbox_secret = osd_block_lv.tags['ceph.cephx_lockbox_secret']
-            self.with_tpm = bool(osd_block_lv.tags.get('ceph.with_tpm', 0))
+            self.with_tpm = osd_block_lv.tags.get('ceph.with_tpm') == '1'
             if not self.with_tpm:
                 encryption_utils.write_lockbox_keyring(osd_id,
                                                        osd_fsid,