Gilles Peskine edf9a6576d Refactor AEAD setup into a common function
There was a lot of repetition between psa_aead_encrypt and
psa_aead_decrypt. Refactor the code into a new function psa_aead_setup.
The new code should behave identically except that in some cases where
multiple error conditions apply, the code may now return a different
error code.

Internally, I rearranged some of the code:

* I removed a check that the key type was in CATEGORY_SYMMETRIC because
  it's redundant with mbedtls_cipher_info_from_psa which enumerates
  supported key types explicitly.
* The order of some validations is different to allow the split between
  setup and data processing. The code now calls a more robust function
  psa_aead_abort in case of any error after the early stage of the setup.
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