sip: Get Rid of private copy of f_mgcp_addr2addrtype()

The function was copied from MGCP_Templates.ttcn since the logic is the
same for SDP, but copied in order to avoid depending on whole MGCP file.
Since now SDP logic has been moved to its own SDP_Templates and a new
f_sdp_addr2addrtype() was added, use that one.

Change-Id: I27ce46b6d23ba0f2704dd0cee290ed519dec278e
2 files changed