Revert "mm, oom: change type of oom_score_adj to short"

This reverts commit b73092d78c0e2c822cc310594061d44810a5c008.
Revert "android/lowmemorykiller: Account for total_swapcache_pages"

This reverts commit 9af2b5a22e47bcec5cfb3a7b32e3bf941ba6bef5.
Revert "lowmemorykiller: make default lowmemorykiller debug message useful"

This reverts commit 2b559d643cedd37a5fe340a8258f1fe11d793309.
Revert "staging: lmk: Fine tune OOM for screen on/off"

This reverts commit 3f768a964af53ba0858ad8ebf5d652242b35bd66.