padata: purge get_cpu and reorder_via_wq from padata_do_serial

padata: purge get_cpu and reorder_via_wq from padata_do_serial

commit 065cf577135a4977931c7a1e1edf442bfd9773dd upstream.

With the removal of the padata timer, padata_do_serial no longer
needs special CPU handling, so remove it.

Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>