Re-compute oom adj in case cycles are found in partial update

The partial oom adj update could encounter cycles, in which case
its omm adj score shouldn't be used. We'll need to perform another
round of computation on all its associated processes.

Meanwhile, removed one of the legacy updateOomAdjLocked variants,
as it's always calling into another variant actually.

Bug: 184310015
Test: atest MockingOomAdjusterTests
Test: atest CtsAppTestCases
Change-Id: I67815344134ca122312c3242a18083cafe1519a5