Attempt to fix the ActivityThreadClientTest test case failed.

ActivityThreadclient test case failed in emulator environment, but they
always work successfully on devices. This CL try to fix the test
case failed by mocking the LoadApk#updateApplicationInfo function
because the purpose of the test focuses on activity client state changes
behavior.

Bug: 144675058
Test: atest FrameworksMockingCoreTests:android.app.activity.ActivityThreadClientTest
Change-Id: I8bec296b65a4e688166fde0f2803bdb06d981a30