Do not mount the whole Android/data and Android/obb anymore

The package list should not be empty, and we should always bind mount
Android/obb/$PKG and Android/data/$PKG, otherwise apps may able to
access Android/obb and Android/data directly.

Bug: 152018883
Test: atest AdoptableHostTest
Test: atest FuseDaemonHostTest

Change-Id: I47660bb9756bede246ca6b93ca31ebefade0d6f5