Revert "lowmemorykiller: Account for highmem during kswapd reclaim"

This reverts commit ab85d9ea25a45e56a66b85c9643d2ae3cec2cf1c.
Revert LOWMEMKILL short to int
Revert "staging:android:lmk: Use for_each_thread helper"

This reverts commit 51754ab23c701858a24008ff835502cf7fd0b700.
Revert "staging: android: lmk: check TIF directly"

This reverts commit a9265b8f6e87fabcb94b911c455fc24da018ff5d.
Revert "staging: android: lmk: skip if killed by lmk"

This reverts commit 41892b2023a88b17dc41755c9d203e13be7a3e43.
Revert "trace: memkill: provide fixed zone info columns."

This reverts commit c242df261048666d92f4571cc55ac8d2a139a6ba.