BSC_Tests_VAMOS: fix TC_vamos_multiplex_tch_f_tch_f

Properly clean up conns. To know when the multiplex is ready, use the
COORD port to tell the other component.

Related: OS#5444
Change-Id: I82b7eccd2ae30fdc3794ea9dad5d2d8f875d702d
1 file changed