lib/crypto: aes-cmac: Add zeroization functions

Code that uses AES-CMAC might need to zeroize their local aes_cmac_key
and/or aes_cmac_ctx structures after use to avoid leaking sensitive
material on the stack.

Provide an aes_cmac_zeroize_key() and an aes_cmac_zeroize_ctx() helper
function that can be used with __cleanup() to automatically clear the
key and context when they go out of scope.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260807125845.1477067-2-thuth@redhat.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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