Floss: Clear pending SDP calls when connection failed

If connection attempt fails (e.g. due to peer is offline), the
already allocated pending SDP calls are not cleared. This causes
the profiles not getting the proper failure events.

This CL clears the pending SDP connections.

Bug: 256217912
Tag: #floss
Test: Manual test in comment#6 and comment#11 of the bug
Change-Id: I27fd91e0b2e80531cad1d334001e86ea2960b9b1