Update LogcatManagerService to call getUidProcessState to retrieve

process state

Bug fix to retrieve process state by calling getUidProcessState() rather
than calling getUidImportance()

This codebase is the continuity of the implementation ag/16618162 to
obtain user consent.

Bug: 193708292
Test: CtsVerifier
Ignore-AOSP-First: pending fix for logcat privacy issue
Change-Id: I55afc2a11744eeb5da83222b953b539c1bc60b05