Frameworks: IME cursor controll be consistent

If user has enabled volume button IME cursor control do not show
navbar IME cursor control. One is enough and can be asumed to be the
default one the user is using. So be consistent and just have one enabled.

Change-Id: I1981579ef3ced52ba94bd84d4f4675cea379562e

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java