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/Sliceable.java

@@ -78,6 +78,13 @@ public interface Sliceable {
         return false;
     }
 
+    /**
+     * Whether or not summary comes from something dynamic (ie, not hardcoded in xml)
+     */
+    default boolean useDynamicSliceSummary() {
+        return false;
+    }
+
     /**
      * Set the copy content to the clipboard and show the toast.
      */