split XtsAes.aes in two, XtsAes.aes_encrypt and XtsAes.aes_decrypt, and add AES_ENCRYPTION_AND_DECRYPTION option constant, to accommodate Linux kernel crypto API model.
in wc_AesXtsSetKeyNoInit(), add FIPS check that main and tweak keys differ, and allow setting encrypt and decrypt keys simultaneously using AES_ENCRYPTION_AND_DECRYPTION.
in wc_AesXtsEncrypt() and wc_AesXtsDecrypt(), error if the required subkey has not been set.
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