FileUtils: Fix missed link

Change-Id: Ibbd06d90bb5966ea5b1e33a12c413cb1870a13c4
core: use Long.parseLong to parse Fat Volume UUID

Integer.parseInt will fail on UUID such as "FEDC-9876"

Change-Id: I06cb340de6b89b3d7afe30327fd21fd3b46da5cf