Convert xml based API allowDynamicSummaryInSlice to java

- Add boolean useDynamicSliceSummary() in Sliceable interface. This is
  the switch equivalent to android:allowDynamicSummaryInSlice in xml. It
  moves the setter closer to regular Sliceable APIs, thus less easily to
  miss.
- Coverted all android:allowDynamicSummaryInSlice to use the java API.
  - Except 2 prefs in my_device_info. They incorrectly set this to true
  previously (controller is not sliceable, no point setting
  dynamicSliceSummary to true. They just won't do anything)

Fixes: 128446156
Test: robolectric
Change-Id: Ic57acd590dec3e87dcf4592df137321d14b854d9

src/com/android/settings/deviceinfo/PhoneNumberPreferenceController.java

@@ -101,6 +101,11 @@ public class PhoneNumberPreferenceController extends BasePreferenceController {
         return true;
     }
 
+    @Override
+    public boolean useDynamicSliceSummary() {
+        return true;
+    }
+
     @Override
     public void copy() {
         final ClipboardManager clipboard = (ClipboardManager) mContext.getSystemService(