PS: Use buffer overlap for object encrypt/decrypt

Use the same buffer for plaintext and ciphertext in
psa_aead_encrypt/decrypt which is called in object
encryption and decryption.
Section "Overlap between parameters" of PSA Certified
Crypto API provides theory support for this.

Signed-off-by: Sherry Zhang <sherry.zhang2@arm.com>
Change-Id: I408032ccc5f48ccbb9c6fd6d56580bcc9456305e
3 files changed