[Expressive Battery] In Battery screen, split items into different category

- For experssive style, items split into 2 groups. Item "battery percentage" for a single group.
- For original style, reorder the items, sort item "battery percentage" at the last.

Bug: 349652542
Test: visual
Flag: com.android.settingslib.widget.theme.flags.is_expressive_design_enabled
Change-Id: I4a163d075ecd94a8079839dc0ad34dd993a7c725

res/xml/power_usage_summary.xml

@@ -44,6 +44,9 @@
         android:title="@string/summary_placeholder"
         settings:controller="com.android.settings.fuelgauge.batterytip.BatteryTipPreferenceController" />
 
+    <PreferenceCategory
+        android:key="power_usage_summary_category"
+        android:layout="@layout/settingslib_preference_category_no_title">
         <Preference
             android:fragment="com.android.settings.fuelgauge.batteryusage.PowerUsageAdvanced"
             android:key="battery_usage_summary"
@@ -63,6 +66,7 @@
             android:title="@string/smart_battery_manager_title"
             settings:controller="com.android.settings.fuelgauge.batterytip.BatteryManagerPreferenceController"
             settings:keywords="@string/keywords_battery_adaptive_preferences" />
+    </PreferenceCategory>
 
     <SwitchPreferenceCompat
         android:key="status_bar_show_battery_percent"