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Convert the VMX implementations of AES-CBC, AES-CTR, and AES-XTS from
the deprecated "blkcipher" API to the "skcipher" API.

As part of this, I moved the skcipher_request for the fallback algorithm
off the stack and into the request context of the parent algorithm.

I tested this in a PowerPC VM with CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>