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/slices/SlicesIndexer.java

@@ -110,8 +110,6 @@ class SlicesIndexer implements Runnable {
             values.put(IndexColumns.CONTROLLER, dataRow.getPreferenceController());
             values.put(IndexColumns.PLATFORM_SLICE, dataRow.isPlatformDefined());
             values.put(IndexColumns.SLICE_TYPE, dataRow.getSliceType());
-            values.put(IndexColumns.ALLOW_DYNAMIC_SUMMARY_IN_SLICE,
-                    dataRow.isDynamicSummaryAllowed());
             values.put(IndexColumns.UNAVAILABLE_SLICE_SUBTITLE,
                     dataRow.getUnavailableSliceSubtitle());