am: Migrate applyOomAdjLSP() to ProcessRecordInternal

This change refactors OomAdjuster.applyOomAdjLSP() to use
ProcessRecordInternal and its methods directly, rather than
casting to ProcessRecord.

To support this, several fields (mRenderThreadTid, mWaitingToKill)
and abstract methods (killLocked, toShortString, getNextPssTime,
setLastCpuTime) were moved from ProcessRecord to
ProcessRecordInternal. The OomAdjuster.Callback interface was
also updated to delegate these functionalities, aligning with
the Process State Controller (PSC) refactoring.

Bug: 441412109
Test: m services.core
Test: atest MockingOomAdjusterTests OomAdjusterTests
Test: atest FrameworksServicesTestsRavenwood_ProcessStateController
Flag: EXEMPT PURE_REFACTOR

Change-Id: I4f48d5025e07af52b5cd122b2476d902f6aaa283