use libosmocore to parse cell identifiers in osmo-bsc

This replaces custom cell identifier parsing in the paging code with
calls to the new cell identifier parser implementation in libosmocore
(which was derived from the code that is now being replaced here).

The bssap tests will fail unless this other change is merged to
libosmocore as well: https://gerrit.osmocom.org/#/c/7288/

Related: OS#2847
Change-Id: I9e2002fbbe135287e9ce09caa3f0a85a84529463
Depends: I7f3e8ace26176e9cbfe2542961d2a95662aa4d97
1 file changed