Add min_score_adj into LmkKillOccurred event

Log min_score_adj when lmkd kills a process to determine the oom_score
levels that lmkd considers during the kill.
Accompanies Piper cl/236692672

Bug: 123024834
Change-Id: Ibfec13ef80ef1d74f5f224dde2e24970f7a88bfa
Signed-off-by: Suren Baghdasaryan <surenb@google.com>