Revert "Always call out to KeyguardHostView when something in our state changes."

This reverts commit 2313fde17ebd62437e74c780d9dfb93c8d0f2e8a.
Add option to hide music controls in lockscreen.

JIRA:CYAN-1566
Change-Id: Iae3dd9914b1685c6bf1e39e421372ce0bdfb93cc

Conflicts:

	core/java/android/provider/Settings.java
Always call out to KeyguardHostView when something in our state changes.

KeyguardHostView already takes care to not add or remove the transport
control twice.
This should hopefully fix some conditions where the transport control
was still being shown although the media player already abandoned audio
focus.

Change-Id: Ib4577cdbfcea0a89efbbd0df70646afe8e677e0d