Remove stage type from split screen APIs

Bug: 198438631
Test: manual check
Change-Id: Ic4f41e39013e4d49585da4cda9b28151c549357a
diff --git a/quickstep/src/com/android/quickstep/SystemUiProxy.java b/quickstep/src/com/android/quickstep/SystemUiProxy.java
index 2543e6c..5fd66d8 100644
--- a/quickstep/src/com/android/quickstep/SystemUiProxy.java
+++ b/quickstep/src/com/android/quickstep/SystemUiProxy.java
@@ -593,11 +593,11 @@
         }
     }
 
-    public void startShortcut(String packageName, String shortcutId, int stage, int position,
+    public void startShortcut(String packageName, String shortcutId, int position,
             Bundle options, UserHandle user) {
         if (mSplitScreen != null) {
             try {
-                mSplitScreen.startShortcut(packageName, shortcutId, stage, position, options,
+                mSplitScreen.startShortcut(packageName, shortcutId, position, options,
                         user);
             } catch (RemoteException e) {
                 Log.w(TAG, "Failed call startShortcut");
@@ -605,11 +605,11 @@
         }
     }
 
-    public void startIntent(PendingIntent intent, Intent fillInIntent, int stage, int position,
+    public void startIntent(PendingIntent intent, Intent fillInIntent, int position,
             Bundle options) {
         if (mSplitScreen != null) {
             try {
-                mSplitScreen.startIntent(intent, fillInIntent, stage, position, options);
+                mSplitScreen.startIntent(intent, fillInIntent, position, options);
             } catch (RemoteException e) {
                 Log.w(TAG, "Failed call startIntent");
             }