utils: remove bogus cache not found error after refresh command

Remove log message "Cannot find device path to cache" spamming
logs during operations such as refresh in clients without CACHE
partition.

src/utils/probe.py

@@ -142,7 +142,6 @@ def get_cache_dev_path():
     proc_blkid = subprocess.run(['blkid', '-L', 'CACHE'],
                                 stdout=subprocess.PIPE)
     if proc_blkid.returncode != 0:
-        logging.error('Cannot find device path to cache')
         return ''
 
     return proc_blkid.stdout.decode().strip()