crypto: skcipher - Remove SKCIPHER_REQUEST_ON_STACK()

Now that all the users of the VLA-generating SKCIPHER_REQUEST_ON_STACK()
macro have been moved to SYNC_SKCIPHER_REQUEST_ON_STACK(), we can remove
the former.

Change-Id: I28988ad863bfcc215b329c5410e6a6bf9ab7442e
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Git-Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-Commit: a9cbfe4c784436368790f0c59674f99ba97ae21e
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>