AndroidRuntime: reduce logcat debug spam

this ought to prevent log messages similar to:
D/AndroidRuntime(12391):
D/AndroidRuntime(12391): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime(12391): CheckJNI is OFF

Change-Id: Ie6948daf552d138c97ade941bedb8714f03145a3