Allow multiple clock plugins simultaneously

Test: atest ClockRegistryTest
Bug: 248101364
Change-Id: I92380d19fcbbbcdb3d3c5d292d44fd57f8595996

packages/SystemUI/shared/src/com/android/systemui/shared/clocks/ClockRegistry.kt

@@ -105,7 +105,8 @@ open class ClockRegistry(
             )
         }
 
-        pluginManager.addPluginListener(pluginListener, ClockProviderPlugin::class.java)
+        pluginManager.addPluginListener(pluginListener, ClockProviderPlugin::class.java,
+            true /* allowMultiple */)
         context.contentResolver.registerContentObserver(
             Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_CUSTOM_CLOCK_FACE),
             false,

packages/SystemUI/tests/src/com/android/systemui/shared/clocks/ClockRegistryTest.kt

@@ -113,7 +113,7 @@ class ClockRegistryTest : SysuiTestCase() {
         registry.isEnabled = true
 
         verify(mockPluginManager)
-            .addPluginListener(captor.capture(), eq(ClockProviderPlugin::class.java))
+            .addPluginListener(captor.capture(), eq(ClockProviderPlugin::class.java), eq(true))
         pluginListener = captor.value
     }