core: Remove usages of adding a CDA message type from a string

Remove calls to addCanDoActionMessage with a VdcBllMessages.TYPE.toString()
as the convention is to add the type itself rather than a string with
the message type name

Change-Id: I48b76499be3fc2301d0dc1ff1da2fb020cf74ee6
Signed-off-by: Tal Nisan <tnisan@redhat.com>