Separate the PREVIOUS_APP_ADJ scores.

Separate the PREVIOUS_APP_ADJ scores with respect to their position in
the LRU list relative to each other, to avoid the killing of these
processes in random order by LMKD.

Bug: 359912586
Change-Id: Ida5b1f8ce5e3eb902b33185db39396274ea5e215
Test: atest MockingOomAdjusterTests
Flag: build.FLAG_OOMADJUSTER_PREV_LADDERING
5 files changed