lmkd: Add adaptiveness for ulmk

Current implementation is in such a way that when we have higher file
cache levels and a psi_medium/crit event is raised, these events are
forced to ignore. The side effects of this is that to get free memory
system is now forced to always reclaim this page cache thus leads to
thrashing, slowness of the system response e.t.c. Instead killing of
tasks could be helpful in such situations. It is this logic to force
kill a task vs reclaim the memory is the adaptiveness to ULMK.

We rely on PSI_FULL = 80msec event which we call it as a super critical
event and in such scenario adjust adj of the task that was selected by
medium or critical events. And incase of just critical event, adjust
the adj based on the min_free levels, availbility of free and cache
memory levels.

CRs-Fixed: 2590129
Change-Id: I0d7fc88657a6294aaa81ab80410c021140b23d30

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