Review comments followup

These are review comments followup from ag/17399997

Bug: b/218187058
Test: manually test thet Launcher3 features work correctly
Change-Id: I9865a37c1ed663370dc28e7678994f3d961e3cd1
diff --git a/src/com/android/launcher3/Hotseat.java b/src/com/android/launcher3/Hotseat.java
index 9c749aa7..d1d6c18 100644
--- a/src/com/android/launcher3/Hotseat.java
+++ b/src/com/android/launcher3/Hotseat.java
@@ -41,7 +41,7 @@
 
     @ViewDebug.ExportedProperty(category = "launcher")
     private boolean mHasVerticalHotseat;
-    private Workspace mWorkspace;
+    private Workspace<?> mWorkspace;
     private boolean mSendTouchToWorkspace;
     @Nullable
     private Consumer<Boolean> mOnVisibilityAggregatedCallback;
@@ -122,7 +122,7 @@
         InsettableFrameLayout.dispatchInsets(this, insets);
     }
 
-    public void setWorkspace(Workspace w) {
+    public void setWorkspace(Workspace<?> w) {
         mWorkspace = w;
     }