Revert "RecoverySystem: Fix the issue in installPackage()."

This reverts commit 9f7a0acd.

Bug: 34350643
Bug: 34396955
Test: installPackage() doesn't cause deadlock if it doesn't call
      processPackage() prior to that.
Change-Id: I1da055c86a3326ae341da1b4d5dc79ab4be256fb