crypto: skcipher - Allow sync algorithms with large request contexts

Some sync algorithms may require a large amount of temporary
space during its operations.  There is no reason why they should
be limited just because some legacy users want to place all
temporary data on the stack.

Such algorithms can now set a flag to indicate that they need
extra request context, which will cause them to be invisible
to users that go through the sync_skcipher interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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