lib/crypto: aes: Provide functions for zeroizing aes_key and aes_enckey

Some crypto functions need to zeroize their local aes_key or aes_enckey
structures after use to avoid leaking sensitive material on the stack.
Provide aes_zeroize_key() and aes_zeroize_enckey() helper functions that
can be used with __cleanup() to automatically zeroize the structs when
they go out of scope.

While we're at it, replace the memzero_explicit() calls in lib/crypto/aes.c
with the new helper functions.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260916095022.604354-2-thuth@redhat.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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