FrameworkBluetoothTests: Set an accessible test-filter-dir

    <test class="com.android.tradefed.testtype.AndroidJUnitTest" >

        <option name="package" value="com.android.framework.bluetooth.tests" />

        <!-- include and exclude filters go into /data/local/tmp/ajur/ by default

             However it's prohibited for access by system uid packages.

             So instead we use the app cache folder for filter -->

        <option name="test-filter-dir" value="/data/data/com.android.bluetooth/cache" />

        <option name="hidden-api-checks" value="false"/>

        <option name="runner" value="androidx.test.runner.AndroidJUnitRunner"/>

    </test>