Fixed vts tests cases which do not support factory attestation.
Test: Run keymint Vts tests.

Change-Id: I8055fef8df5ec77e317f810f9b95a53311b23cf0
diff --git a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
index 146a527..ff4036c 100644
--- a/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
+++ b/security/keymint/aidl/vts/functional/KeyMintAidlTestBase.cpp
@@ -1228,6 +1228,14 @@
     }
 }
 
+vector<uint64_t> KeyMintAidlTestBase::ValidExponents() {
+    if (SecLevel() == SecurityLevel::STRONGBOX) {
+        return {65537};
+    } else {
+        return {3, 65537};
+    }
+}
+
 vector<Digest> KeyMintAidlTestBase::ValidDigests(bool withNone, bool withMD5) {
     switch (SecLevel()) {
         case SecurityLevel::SOFTWARE: