remove hkdf header file from query_config template

Signed-off-by: Ben Taylor <bentay03@e140121.arm.com>
diff --git a/scripts/data_files/query_config.fmt b/scripts/data_files/query_config.fmt
index 9be9674..1251759 100644
--- a/scripts/data_files/query_config.fmt
+++ b/scripts/data_files/query_config.fmt
@@ -41,7 +41,6 @@
 #include "mbedtls/entropy.h"
 #include "mbedtls/error.h"
 #include "mbedtls/gcm.h"
-#include "mbedtls/hkdf.h"
 #include "mbedtls/hmac_drbg.h"
 #include "mbedtls/md.h"
 #include "mbedtls/md5.h"