使ActionBarOverflow常显

N/A

这个Change是从4.4移植过来，去除了对硬件Menu的依赖

Change-Id: Ifc5ff5bc9ca63a05af5582b12ee40aa0ad3eb2da

Conflicts:
amend miui hook

Change-Id: I9b5196fc04111203adbb96e8fffea24e92b86847