Support of GSM uses socket interface for both network and mobile

Support of GSM uses socket interface for both network and mobile

There is no linking of any osmocomBB source code required. In order
to use osmocomBB or OpenBSC, just enable the interface, as described
in defaults/interface.conf. At osmocomBB/mobile or at OpenBSC, just
use the option "-m" to enable the socket interface.

Enable GSM at LCR with "./configure --with-gsm-ms --with-gsm-bs".