Tegra: remove unused cortex_a53.h

This patch removes the unused cortex_a53.h header file from
common Tegra files.

This change fixes the violation of CERTC Rule: DCL23.

Change-Id: Iaf7c34cc6323b78028258e188c00724c52afba85
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/aarch64/tegra_helpers.S

@@ -4,12 +4,13 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
+
 #include <arch.h>
 #include <asm_macros.S>
 #include <assert_macros.S>
-#include <cpu_macros.S>
-#include <cortex_a53.h>
 #include <cortex_a57.h>
+#include <cpu_macros.S>
+
 #include <platform_def.h>
 #include <tegra_def.h>
 #include <tegra_platform.h>

plat/nvidia/tegra/common/tegra_bl31_setup.c

@@ -17,7 +17,6 @@
 #include <bl31/bl31.h>
 #include <common/bl_common.h>
 #include <common/debug.h>
-#include <cortex_a53.h>
 #include <cortex_a57.h>
 #include <denver.h>
 #include <drivers/console.h>