cosmetic: a_iface: Harmonize log statements

Clean up the log statements in a_iface*.c, which was very inconsistent.
For example "BSC sending" is very confusing.  We are receiving from the BSC,
and it did already send the message, it is no longer in the process of
sending it if we have already received it in the MSC.

Change-Id: Id50e964d86713ae506d4e7657159797e09501d99
2 files changed