Do not skip traversal of IME container when display is frozen

Otherwise WindowState#mOrientationChanging IME window may be skipped
to be updated from forAllWindows. And even when window frozen timeout
is reached (DisplayContent#onWindowFreezeTimeout), if forAllWindows
still skips IME, the device will look like frozen forever. Unless
on/off screen to force canceling the state.

And since CL [1] has handled the case of IME with fixed rotation,
the restriction added in CLs [2],[3] can be removed. That eliminates
frozen for normal rotation animation.

[1]: I0b036594161898f9df6ad71f0adb5fe93880161a
[2]: Idfdf129adbfbee6634d8a27aa78da1f631bd213b
[3]: Idef12249806e4a6860b8cd190df4f0f8cad13c19

Bug: 207059118
Test: 1. Launch a portrait app which keeps showing IME.
      2. Return to home be home key or swiping.
      3. Hold the device in landscape.
      4. Launch the app again.
      The app should show in landscape directly and IME will
      fade-in when it is drawn in landscape.
Change-Id: Iceaedbfdb75e68e9f7fb8fd4a1bf8f35a779797e