Improve privacy dashboard live data

improve privacy dashboard live data performace, we
are working on new implementation to fix OOM and
ANR issue completely. Improving the current code
could be helpful, just in case we need to fall back.

Bug: 300269033
Relnote: Improve privacy dashboard performance and fix OOM/ANR
Test: manual
Test: gts-tradefed run gts-dev -m GtsPermissionUiTestCases
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:cbbe9b1c3d91a7d169274ef3fd436c32fe1115a0)
Merged-In: I3188f8e209ec5e9d8b8c1dfe8064e99a317fbc7e
Change-Id: I3188f8e209ec5e9d8b8c1dfe8064e99a317fbc7e