Clamp the new oom adj to perceptible if the important caller requests

In case the more important client of the binding requests to restrict
the oom adj score of the service, make sure clamp it correctly.

Bug: 145785052
Test: Manual - Launch app with notification listener, check oom adj score
Change-Id: I596f53c6ac6bd5d342165cf8224d0d0844eb016e