SCTP: Fix build issues with SCTP AUTH.

SCTP-AUTH requires selection of CRYPTO, HMAC and SHA1 since
SHA1 is a MUST requirement for AUTH.  We also support SHA256,
but that's optional, so fix the code to treat it as such.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig
index 8210f54..5390bc7 100644
--- a/net/sctp/Kconfig
+++ b/net/sctp/Kconfig
@@ -6,9 +6,9 @@
 	tristate "The SCTP Protocol (EXPERIMENTAL)"
 	depends on INET && EXPERIMENTAL
 	depends on IPV6 || IPV6=n
-	select CRYPTO if SCTP_HMAC_SHA1 || SCTP_HMAC_MD5
-	select CRYPTO_HMAC if SCTP_HMAC_SHA1 || SCTP_HMAC_MD5
-	select CRYPTO_SHA1 if SCTP_HMAC_SHA1
+	select CRYPTO
+	select CRYPTO_HMAC
+	select CRYPTO_SHA1
 	select CRYPTO_MD5 if SCTP_HMAC_MD5
 	---help---
 	  Stream Control Transmission Protocol