Perform oomAdjUpdate prior to scheduling service transactions

To ensure the apps executing the service transactions(start/stop etc.)
are in the correct proc state and unfrozen.

Bug: 191429032
Test: atest MockingOomAdjusterTests
Test: atest CtsAppTestCases
Change-Id: I32271adbe75afe377014f036e017667a7857dbf9
Merged-In: I32271adbe75afe377014f036e017667a7857dbf9