build: Do not require more headers from OpenBSC
build: Do not require more headers from OpenBSC

There should be no other OpenBSC headers included and nobody is using
bsc_controlif_setup. Remove the include. This was introduced in
4723a195081f0f9ff561e360620ee0ade50a2b39.

Change-Id: I581f938e8fe9161b1d7076cedd74ff192cea86b2

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts