Make "Take bugreport" dialog scrollable.

Without scrolling, such dialog might not fit on small screens, specially
on multi-window environments.

BUG: 28137501
Change-Id: I84ed1ff946d1023712efcf80f15bac4a57966f19

res/layout/bugreport_options_dialog.xml

@@ -15,7 +15,8 @@
      limitations under the License.
 -->
 
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android">
+    <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="horizontal"
@@ -78,3 +79,4 @@
             android:textColor="?android:attr/textColorSecondary" />
 
     </RelativeLayout>
+</ScrollView>