Revert "Revert "Update Trusted Credentials screen in settings""

This reverts commit 0f0de0bdd021bad5f85fdb0399a4ea91a1611e25.

Change-Id: Ia3d0907e3d7c2ec42d64e45f60e3dfaffb932c3d

keystore/java/android/security/KeyChain.java

@@ -397,7 +397,8 @@ public final class KeyChain {
         return KeyStore.getInstance().isHardwareBacked(algorithm);
     }
 
-    private static X509Certificate toCertificate(byte[] bytes) {
+    /** @hide */
+    public static X509Certificate toCertificate(byte[] bytes) {
         if (bytes == null) {
             throw new IllegalArgumentException("bytes == null");
         }