Remove logic for revealing recorders in mic indicator

Removing the mRevealRecordingPackages flag and all the logic for
revealing identities of the recording applications in microphone
disclosure indicator.

Bug: 160676348
Bug: 161744641
Test: adb shell appops start com.google.android.katniss 27
Test: adb shell appops stop com.google.android.katniss 27
Change-Id: Ie62609dbf2f2b35f6847c2e2024ca98b66785c4f