lib/crypto: aes-ccm: Provide functions for zeroizing aes_ccm* structures

In certain cases crypto code needs to zeroize their local aes_ccm_key
or aes_ccm_ctx structures after use to avoid leaking sensitive material.
Provide aes_ccm_zeroize_key() and aes_ccm_zeroize_ctx() helper functions
that e.g. can be used with __cleanup() to automatically zeroize the
structures when they go out of scope.

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

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260916095022.604354-5-thuth@redhat.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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