Verified boot wrapper - replace utility functions

This is part 3 of the vboot wrapper API refactoring.  It replaces the
function calls to utility.c functions with new API calls.  (It also
fixes up some integer type mismatches in cryptolib that were causing
warnings on the H2C build; those had been fixed a while ago in H2C but
hadn't been propagated across.)

BUG=chromium-os:17006
TEST=make && make runtests

Change-Id: I771085dcdf79d9592de64f35e3b758111a80dd9f
Reviewed-on: http://gerrit.chromium.org/gerrit/3263
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Randall Spangler <rspangler@chromium.org>

firmware/lib/vboot_common.c

@@ -7,6 +7,7 @@
  */
 
 
+#include "vboot_api.h"
 #include "vboot_common.h"
 #include "utility.h"
 
@@ -231,7 +232,7 @@ int KeyBlockVerify(const VbKeyBlockHeader* block, uint64_t size,
                                 SHA512_DIGEST_ALGORITHM);
     rv = SafeMemcmp(header_checksum, GetSignatureDataC(sig),
                     SHA512_DIGEST_SIZE);
-    Free(header_checksum);
+    VbExFree(header_checksum);
     if (rv) {
       VBDEBUG(("Invalid key block hash.\n"));
       return VBOOT_KEY_BLOCK_HASH;