[Safer intents] Credentials

To avoid implicit intents, make intents launch explicitly.

Bug: 323061508
Test: build
Change-Id: I236b6214e761574c82a81b4a7e068f617eae5e9d

src/com/android/settings/security/CredentialStorage.java

@@ -139,6 +139,7 @@ public final class CredentialStorage extends FragmentActivity {
             }
 
             final Intent installIntent = new Intent(ACTION_INSTALL)
+                    .setPackage(getPackageName())
                     .setFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT)
                     .putExtras(bundle);
             startActivityAsUser(installIntent, new UserHandle(dstUserId));