[Regional Preference] Add content descripiton to the img for Talkback

Test: manual
Bug: 289176529
Change-Id: Iaa7e6d8fca1036be58ea5bb17e722935f5f9f424
diff --git a/res/layout/preference_check_icon.xml b/res/layout/preference_check_icon.xml
index 1b759fc..bd0dd79 100644
--- a/res/layout/preference_check_icon.xml
+++ b/res/layout/preference_check_icon.xml
@@ -20,4 +20,5 @@
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_centerVertical="true"
-    android:layout_marginHorizontal="16dp"/>
\ No newline at end of file
+    android:layout_marginHorizontal="16dp"
+    android:contentDescription="@*android:string/checked"/>
\ No newline at end of file