crypto: sha256 - Merge crypto/sha256.h into crypto/sha.h

The generic sha256 implementation from lib/crypto/sha256.c uses data
structs defined in crypto/sha.h, so lets move the function prototypes
there too.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/purgatory/purgatory.c

@@ -9,7 +9,7 @@
  */
 
 #include <linux/bug.h>
-#include <crypto/sha256.h>
+#include <crypto/sha.h>
 #include <asm/purgatory.h>
 
 #include "../boot/string.h"