bsc: Fix IPA_CFG_PORT handling several connections

Recent commit changing the layout of bts/trx port config made
IPA_CFG_PORT be connected severa times when calling f_ipa_rsl_start()
for each BTS/TRX.

Let's have separate ports per BTS/TRX as done in other ports in the
test_CT component.

This avoid this error when calling f_ipa_rsl_stop():
"""
Dynamic test case error: Port IPA_CFG_PORT has more than one active
connections. Message can be sent on it only with explicit addressing.
"""

Change-Id: I916186c87c398ebb2d7f82f73b94de75034e346d
1 file changed