Coverity: remove unnecessary header file includes

This patch removes unnecessary header file includes
discovered by Coverity HFA option.

Change-Id: I2827c37c1c24866c87db0e206e681900545925d4
Signed-off-by: Zelalem <zelalem.aweke@arm.com>
diff --git a/lib/optee/optee_utils.c b/lib/optee/optee_utils.c
index 2a40793..0ad1082 100644
--- a/lib/optee/optee_utils.c
+++ b/lib/optee/optee_utils.c
@@ -1,15 +1,12 @@
 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <assert.h>
-#include <errno.h>
 
-#include <arch_helpers.h>
 #include <common/debug.h>
-#include <common/desc_image_load.h>
 #include <lib/optee_utils.h>
 
 /*