platedetector: remove unused functions
platedetector: remove unused functions

Change-Id: Iadbc493f1b1e756c768532e14d71cc7985597b6d

shelsonjava/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,Kurento/kms-elements