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

tests/robotests/src/com/android/settings/slices/SliceDataConverterTest.java

@@ -124,7 +124,6 @@ public class SliceDataConverterTest {
         assertThat(fakeSlice.getPreferenceController()).isEqualTo(FAKE_CONTROLLER_NAME);
         assertThat(fakeSlice.getSliceType()).isEqualTo(SliceData.SliceType.SLIDER);
         assertThat(fakeSlice.isPlatformDefined()).isTrue(); // from XML
-        assertThat(fakeSlice.isDynamicSummaryAllowed()).isTrue(); // from XML
         assertThat(fakeSlice.getUnavailableSliceSubtitle()).isEqualTo(
                 "subtitleOfUnavailableSlice"); // from XML
     }