Adjust concurrency configuration.

Change the concurrency configuration so that we use all available
contexts when the screen is off and memory is available. Also adjust the
parameters of some work types to make more sense in the tiered
structure.

Bug: 141645789
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/job
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/job
Test: atest CtsJobSchedulerTestCases
Change-Id: I3d1b334158b45523e13d3f3a302a9c4453aea159