[Catalyst] Support multiple restriction keys

NO_IFTTT=Catalyst only

Bug: 377600992
Flag: com.android.settings.flags.catalyst
Test: testdpc
Change-Id: If7212b5402f7e271b7fdbd2a43bed0e11ee6f15f

src/com/android/settings/notification/MediaVolumePreference.kt

@@ -58,8 +58,8 @@ open class MediaVolumePreference :
 
     override fun isEnabled(context: Context) = super<PreferenceRestrictionMixin>.isEnabled(context)
 
-    override val restrictionKey: String
-        get() = UserManager.DISALLOW_ADJUST_VOLUME
+    override val restrictionKeys
+        get() = arrayOf(UserManager.DISALLOW_ADJUST_VOLUME)
 
     override fun storage(context: Context): KeyValueStore {
         val helper = createAudioHelper(context)