[ActivityManager] No home activity resumed and cause

key dispatch ANR

Symptom:
In some scenario, there might have two home tasks
in the home stack. If the top home task was finishing
and expected to return to home stack, no activity
will resume.

Root Cause:
Unable to perform resumeHomeStackTask() because the
resumeTopActivityLocked() has been prevented to invoke
recursively.

Solution:
Just resume the next activity if already in home stack

Change-Id: I24ecbcac6cee4ddbd90cdd27c4f4915cffb9b354