crypto: arm/aes-neonbs - use typed init/exit routines for XTS

Use the typed skcipher init/exit routines instead of the generic
cra_init/_exit routines when instantiating/releasing the XTS
skciphers.

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