Additional LMK diagnostic information

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

Change-Id: I190f70758daa442b8605e17960c74574676fa3ae
Test: build with corresponding lmkd change
1 file changed
tree: fe22684912bbbe3aa01be9ebd2d6263aae11ae39
  1. stats/