crypto: blowfish - disable AVX2 implementation

It appears that the performance of 'vpgatherdd' is suboptimal for this kind of
workload (tested on Core i5-4570) and causes blowfish-avx2 to be significantly
slower than blowfish-amd64. So disable the AVX2 implementation to avoid
performance regressions.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -823,6 +823,7 @@ config CRYPTO_BLOWFISH_X86_64
 config CRYPTO_BLOWFISH_AVX2_X86_64
 	tristate "Blowfish cipher algorithm (x86_64/AVX2)"
 	depends on X86 && 64BIT
+	depends on BROKEN
 	select CRYPTO_ALGAPI
 	select CRYPTO_CRYPTD
 	select CRYPTO_ABLK_HELPER_X86