GCC: missing & calling CBBFunctionToVector in Ed25519PrivateKey

Bug: 819294
Change-Id: I073c5b4200b92736ba533c176fb116f83f3ee8ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248758
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#779357}

device/fido/virtual_fido_device.cc

@@ -215,7 +215,7 @@ class Ed25519PrivateKey : public EVPBackedPrivateKey {
         cbor::Writer::Write(cbor::Value(std::move(map))));
 
     std::vector<uint8_t> der_bytes(
-        CBBFunctionToVector<decltype(EVP_marshal_public_key),
+        CBBFunctionToVector<decltype(&EVP_marshal_public_key),
                             EVP_marshal_public_key>(pkey_.get()));
 
     return std::make_unique<PublicKey>(