Additional LMK diagnostic information

Add free memory / swap as well as the kill reason to better understand
and diagnose lmkd behaviour in the field

Test: build with corresponding lmkd change
Bug: 168117803
Merged-In: I190f70758daa442b8605e17960c74574676fa3ae
Change-Id: I190f70758daa442b8605e17960c74574676fa3ae
1 file changed