Add test config to DocumentsUITests

<?xml version="1.0" encoding="utf-8"?>

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<configuration description="Runs Tests for DocumentsUI.">

    <target_preparer class="com.android.tradefed.targetprep.TestAppInstallSetup">

        <option name="test-file-name" value="DocumentsUITests.apk" />

    </target_preparer>

    <option name="test-suite-tag" value="apct" />

    <option name="test-tag" value="DocumentsUITests" />

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

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

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

    </test>

</configuration>