Makefile: Update titan.ProtocolModules.BSSMAP to new osmocom/master branch

The repository branches were rebased and rearranged, where now its master branch
follows upstream, and we keep an osmocom/master branch with our own
patches (Osmux, not aimed at upstream) which can then be rebased on top of master.

Related: OS#6011
Change-Id: I1ec7cb6f8fa5acaca6eb434ea9449119de078c94
1 file changed