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

This reverts commit c1cf69a78577ab6a9759410e5b4a100c85680441.
Revert "lowmemorykiller: Use asynchronous compaction"

This reverts commit 3dd09c2df267a03773c8e56074df081f89a460d5.
Revert "drivers: staging: android: lmk compile fixup"

This reverts commit 573db7a4687e5d38c33dc887506f86a5ac59d40d.
Revert "mm/compaction.c: added bool sync declaration"

This reverts commit e4f322691916554e50c74514cfa4432bcb52b17a.
++ lowmemorykiller: fully revert
update defconfig
ancora_defconfig: restore arco changes