Error in AESGCM sample

https://github.com/aws-samples/aws-cloudhsm-jce-examples/blob/bc6aa764fe2f8bcdf848494157456bd1158b81fb/src/main/java/com/amazonaws/cloudhsm/examples/AESGCMEncryptDecryptRunner.java#L93

According to JCE spec Cipher.update(byte[]) is using for stream processing - it returns byte[] that shouldn't be ignored

```
encCipher.update(plainText);
byte[] ciphertext = encCipher.doFinal();
```

should be
```
byte[] ciphertext = encCipher.doFinal(plainText);
```

Or it is something special in CloudHSM provider implementation ?

Start with src/main/java/com/amazonaws/cloudhsm/examples/AESGCMEncryptDecryptRunner.java at line 93 and compare the sample's Cipher.update(byte[]) and doFinal() usage with the JCE specification. Check whether the CloudHSM provider changes the expected behavior. Done means correcting or confirming the AES-GCM sample so the plaintext and ciphertext handling is spec-compliant.

Written by the indexing model from the issue text.