crypto/hmac: Fix typo in function implementation names

"hmac" was mistyped as "hmca", breaking linking to some prototype
functions. Also, a couple of includes were missing.

Signed-off-by: Niccolò Maggioni <nicco.maggioni+nuttx@gmail.com>

include/crypto/hmac.h

@@ -26,6 +26,9 @@
  ****************************************************************************/
 
 #include <sys/types.h>
+#include <crypto/md5.h>
+#include <crypto/sha1.h>
+#include <crypto/sha2.h>
 
 typedef struct _HMAC_MD5_CTX
 {