Add keywords for AOD setting.

Used the WiFi slice for inspiration: ag/6793584

Also added "ambient" to the keywords, since "ambient display" is another
phrase used for AOD.

Bug: 279029717
Test: manually checked that the setting shows up when searching for
"aod"
Change-Id: I8a3a4a6635c9724565426b859722242d2bae9e49

src/com/android/settings/display/AmbientDisplayAlwaysOnPreferenceController.java

@@ -22,7 +22,6 @@ import android.os.PowerManager;
 import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.provider.Settings;
-import android.text.TextUtils;
 
 import androidx.preference.Preference;
 
@@ -59,7 +58,7 @@ public class AmbientDisplayAlwaysOnPreferenceController extends TogglePreference
 
     @Override
     public boolean isSliceable() {
-        return TextUtils.equals(getPreferenceKey(), "ambient_display_always_on");
+        return true;
     }
 
     @Override