osmo-hnbgw: depend on osmo-mgw

Fix for:
  | checking for LIBOSMOMGCPCLIENT... no
  | configure: error: Package requirements (libosmo-mgcp-client >= 1.9.0) were not met:
  |
  | No package 'libosmo-mgcp-client' found

Required since osmo-hnbgw Ib9b62e0145184b91c56ce5d8870760bfa49cc5a4.

Change-Id: I79b0525cff5030d72235640eddeabd7540f1bcf9
1 file changed