Initial support for z flip 5 cover screen

see : https://developer.samsung.com/galaxy-z/flex_window.html

app/src/main/AndroidManifest.xml

@@ -310,6 +310,9 @@
       <meta-data
         android:name="android.appwidget.provider"
         android:resource="@xml/scrollable_widget_provider_info"/>
+      <meta-data
+          android:name="com.samsung.android.appwidget.provider"
+          android:resource="@xml/samsung_scrollable_flex_window_widget_meta_info"/>
     </receiver>
 
     <!-- ======================================================== Services = -->

app/src/main/res/xml/samsung_scrollable_flex_window_widget_meta_info.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<samsung-appwidget-provider
+    display="sub_screen">
+</samsung-appwidget-provider>