crypto: talitos - properly lock access to global talitos registers

Access to global talitos registers must be protected for the case when
affinities are configured such that primary and secondary talitos irqs
run on different cpus.

Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>