Fix a regression in setting oom_adj for cached processes

If a cached process happens to be part of a cycle,
it might end up at a score of 1001, which is never
reported to lmkd and hence not killed when under
memory pressure.

Fix: When recomputing oom adjust scores for apps in cycles,
use the last computed raw adj value instead of
UNKNOWN_ADJ.

Fixes: 135948152
Test: atest CtsAppTestCases:ActivityManagerProcessStateTests
      Launch specific known apps that have internal cycles
        and ensure they end up with an oom_adj in the 900s.

Change-Id: I000e6a06cd23873d09b9df3e9ddd280232757d3a