lib/crypto: sm3: Provide a function for zeroizing the sm3_ctx structure

In certain cases crypto code functions need to zeroize their local
sm3_ctx structure after use to avoid leaking sensitive material. Provide
a sm3_zeroize_ctx() helper function that e.g. can be used with __cleanup()
to automatically zeroize the structure when it goes out of scope.

While we're at it, replace the related memzero_explicit() call in
lib/crypto/sm3.c with a call to the new helper function.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260916095022.604354-7-thuth@redhat.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

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