ANDROID: staging: lowmemorykiller: Add config option to support oom_adj values

The conversion to use oom_score_adj instead of the deprecated oom_adj
values breaks existing user-space code. Add a config option to convert
oom_adj values written to oom_score_adj values if they appear to be
valid oom_adj values.

Change-Id: I72512ade5e68c1eeb4f382dfc9ce4f123cb622b8
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Git-Commit: 73f1dd691f22d58c9bfb970cb8b5a3b25fb4f3c3
Git-Repo: https://android.googlesource.com/kernel/common


Signed-off-by: Patrick Daly <pdaly@codeaurora.org>