Fix overlapping issue in Security certificate page

Bug: 263440830
Test: 1) Settings > Security > More security settings > Encryption &
credentials > Trusted credentials > Click a random cert
2) Scroll the list and see if content is overlapping over the spinner

Change-Id: Idc378975ea645214369481a9a7f0b4a85e045a05

src/com/android/settings/TrustedCredentialsDialogBuilder.java

@@ -309,6 +309,8 @@ class TrustedCredentialsDialogBuilder extends AlertDialog.Builder {
 
             LinearLayout certLayout = new LinearLayout(mActivity);
             certLayout.setOrientation(LinearLayout.VERTICAL);
+            // Prevent content overlapping with spinner
+            certLayout.setClipChildren(true);
             certLayout.addView(spinner);
             for (int i = 0; i < views.size(); ++i) {
                 View certificateView = views.get(i);