Revert "staging: android: lowmemorykiller: Don't count reserved free memory"

This reverts commit 3ade0309f6b460a7831a2ac50bba15669f79b3f0.
Revert "mm, oom: change type of oom_score_adj to short"

This reverts commit 63cb0a3ad64b3d951ebe9002cd10a50e1f831679.
Revert "android/lowmemorykiller: Selectively count free CMA pages"

This reverts commit 19340e5779349ce3789489d9269a9992cad9fca0.
Revert "android: lowmemorykiller: add lmk parameters tunning code."

This reverts commit cc9961e53d6b7eb299338d535f8c6badfa393a50.