crypto: gemini - call finalize with bh disabled

Doing ipsec produces a spinlock recursion warning.
This is due to not disabling BH during crypto completion function.

Fixes: 46c5338d

 ("crypto: sl3516 - Add sl3516 crypto engine")
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>