Move IconNormalizer/ShadowGenerator/LauncherIcons to icons package

Bug: 115891474

Sending out the package name changing CL first before I make
LauncherIconsHandler and tests around it.

Change-Id: Ic10479a06333e1435b392a7072cd08782e710cbd
diff --git a/src/com/android/launcher3/WidgetPreviewLoader.java b/src/com/android/launcher3/WidgetPreviewLoader.java
index cf497fd..d47dcee 100644
--- a/src/com/android/launcher3/WidgetPreviewLoader.java
+++ b/src/com/android/launcher3/WidgetPreviewLoader.java
@@ -31,8 +31,8 @@
 import com.android.launcher3.compat.AppWidgetManagerCompat;
 import com.android.launcher3.compat.ShortcutConfigActivityInfo;
 import com.android.launcher3.compat.UserManagerCompat;
-import com.android.launcher3.graphics.LauncherIcons;
-import com.android.launcher3.graphics.ShadowGenerator;
+import com.android.launcher3.icons.LauncherIcons;
+import com.android.launcher3.icons.ShadowGenerator;
 import com.android.launcher3.icons.IconCache;
 import com.android.launcher3.model.WidgetItem;
 import com.android.launcher3.util.ComponentKey;