frameworks: Fix audio routing when plugged to docks

A patch by StevenHarperUK <StevenHarperUK@gmail.com>, with
Change-Id: I3860c04c8f14e8e98d79d82a354a92b78565c3d1 forces an audio
reroute each time a CarDock is plugged in (status == 2 means cardock,
not an audio device; see core/java/android/content/Intent.java).

This caused audio over bluetooth to stop when plugging in a dock.
This patch disables this check by default