Make SHA* function prototypes consistent.

src/platform/vboot_reference/crypto/sha1.c

Index: src/platform/vboot_reference/crypto/sha1.c
diff --git a/src/platform/vboot_reference/crypto/sha1.c b/src/platform/vboot_reference/crypto/sha1.c
index d19a5a2d8b8a0a28fa672c809f8d56c7843d14c5..50f6bf6d58248732736849c81c9ba7298a834702 100644
--- a/src/platform/vboot_reference/crypto/sha1.c
+++ b/src/platform/vboot_reference/crypto/sha1.c
@@ -275,7 +275,7 @@ void SHA1_init(SHA1_CTX* ctx) {
   ctx->count = 0;
 }
 
-uint8_t* SHA1(const void *data, int len, uint8_t *digest) {
+uint8_t* SHA1(const uint8_t *data, int len, uint8_t *digest) {
   const uint8_t *p;
   int i;
   SHA1_CTX ctx;