Drop http://tizen.org/privilege/internal/livecoredump mapping to priv_livecoredump

Drop tizen.org/privilege/internal/livecoredump mapping to priv_livecoredump

The priv_livecoredump group was supposed to be used by system services
wanting to use livecoredump API. (For applications it's granted by app
manifest.)

Unfortunately, it's not allowed by tizen sanity checkers to specify priv_*
groups in dbus policy, which renders the mapping useless.  System services
must use other means to grant access to the API (as described in livecoredump
repository).

Change-Id: I58984358d095515a57d217ca277e3b06cda40703