There are some situations where remsim-client would want to make its
surrounding system aware of, e.g. to take specific action.
This is particularly important on platforms where the simtrace2 firmware
doesn't have direct control over modem reset/poweron or the like.
Change-Id: I61cf4d93c669db137de801f8b147dcffaa6f3abd
Depends: libosmocore.git Ib24ac8a083db32e55402ce496a5eabd8749cc888
Closes: OS#4332