FW: Enable nav bar for devices with hardware keys

Change-Id: I2704e99571deff62523da8113971096f79d14fc9
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>

Conflicts:
	core/java/android/provider/Settings.java
	core/java/android/view/IWindowManager.aidl
	core/java/android/view/WindowManagerPolicy.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
	services/java/com/android/server/wm/WindowManagerService.java

Change-Id: I2704e99571deff62523da8113971096f79d14fc9