PIE: Fix random showing of navbar when swiping from top.

We need to condition here aswell to be sure top swipe doesn't trigger up
navbar at all even if we set its height to 0 is an useless call.

Addressing JIRA AOSPA-151 issue.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Fix: Graphics error when switching to recents using Pie controls

Attempt to fix https://paranoidandroid.atlassian.net/browse/AOSPA-65

I've never been able to reproduce the problem on Hammerhead, Mako or
Grouper, so I can't guarantee that this solves it.

Feedback is needed from a user that constantly experiences this bug.

Change-Id: I950e94dbb9b9d07dedee9b9f8cab6c5b6bceb6b0
PIE: Prevent a rare freeze that appears on quick iterations.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
PIE: Disable orientation sensor when we don't need it

Orientation sensor always enabled causing some device keep awake and
battery drain. This commit fix this issue.

  * Disable/Enable orientation listener when screen turn off/on if PIE
is enabled.
  * If PIE is disabled, recycle it.

Change-Id: I6bda168b3fd62d9f7047ffc3a3c6bfd08e655543