openbsc/README: some fixes, add CSCN and Iu*

OsmoNITB stated to include BTS, should be BSC. Reword some outdated
statements. Add OsmoCSCN and mention IuCS and IuPS interfaces.
1 file changed
tree: 4b721e2f75d55be68cb5a9dba78882f85c2b5873
  1. debian/
  2. openbsc/
  3. .gitignore