init.rc: don't start console unless asked to

This can have a major impact on performance.

We don't want this, even on userdebug/eng builds.

Use the new property "ro.console.enable" to
enable the console service explicitly.

Change-Id: I93e7c65e92261443d1c9c70cfef9aa2ed5ff328a
Signed-off-by: Alex Naidis <alex.naidis@linux.com>
Signed-off-by: Jason Edson <jaysonedson@gmail.com>

Author: TheCrazyLex

rootdir/init.rc

@@ -1235,7 +1235,7 @@ on property:ro.debuggable=1
     # Give reads to anyone for the accessibility trace folder on debug builds.
     chmod 0775 /data/misc/a11ytrace
 
-on init && property:ro.debuggable=1
+on init && property:ro.debuggable=1 && property:ro.console.enable=1
     start console
 
 on userspace-reboot-requested