Fix talkback not announcing requirement in ChooseLock

Fix: 281955512
Test: Manual, verify talkback reads out password requirement on 17th digit
Change-Id: Ia274af9cc515d3ac9d344bd41d008ab5b4dbcabd

src/com/android/settings/password/ChooseLockPassword.java

@@ -523,7 +523,6 @@ public class ChooseLockPassword extends SettingsActivity {
             setupPasswordRequirementsView(headerLayout);
 
             mPasswordRestrictionView.setLayoutManager(new LinearLayoutManager(getActivity()));
-            mPasswordRestrictionView.setAccessibilityLiveRegion(ACCESSIBILITY_LIVE_REGION_POLITE);
             mPasswordEntry = view.findViewById(R.id.password_entry);
             mPasswordEntry.setOnEditorActionListener(this);
             mPasswordEntry.addTextChangedListener(this);

src/com/android/settings/password/PasswordRequirementAdapter.java

@@ -16,6 +16,7 @@
 
 package com.android.settings.password;
 
+import android.annotation.NonNull;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -63,6 +64,11 @@ public class PasswordRequirementAdapter extends
         return mRequirements[position].hashCode();
     }
 
+    @Override
+    public void onViewAttachedToWindow(@NonNull PasswordRequirementViewHolder holder) {
+        holder.mDescriptionText.announceForAccessibility(holder.mDescriptionText.getText());
+    }
+
     @Override
     public void onBindViewHolder(PasswordRequirementViewHolder holder, int position) {
         final int fontSize = mContext.getResources().getDimensionPixelSize(