Tegra: include: fix violations of MISRA Rule 21.1

This patch fixes the violations of Rule 21.1 from all the
Tegra common header files.

Rule 21.1 "#define and #undef shall not be used on a reserved
           identifier or reserved macro name"

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I2e117645c110e04c13fa86ebbbb38df4951d2185
diff --git a/plat/nvidia/tegra/include/drivers/gpcdma.h b/plat/nvidia/tegra/include/drivers/gpcdma.h
index fb5486a..a59df37 100644
--- a/plat/nvidia/tegra/include/drivers/gpcdma.h
+++ b/plat/nvidia/tegra/include/drivers/gpcdma.h
@@ -1,11 +1,12 @@
 /*
  * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __GPCDMA_H__
-#define __GPCDMA_H__
+#ifndef GPCDMA_H
+#define GPCDMA_H
 
 #include <stdint.h>
 
@@ -13,4 +14,4 @@
 			    uint32_t num_bytes);
 void tegra_gpcdma_zeromem(uint64_t dst_addr, uint32_t num_bytes);
 
-#endif /* __GPCDMA_H__ */
+#endif /* GPCDMA_H */