Standardise header guards across codebase

All identifiers, regardless of use, that start with two underscores are
reserved. This means they can't be used in header guards.

The style that this project is now to use the full name of the file in
capital letters followed by 'H'. For example, for a file called
"uart_example.h", the header guard is UART_EXAMPLE_H.

The exceptions are files that are imported from other projects:

- CryptoCell driver
- dt-bindings folders
- zlib headers

Change-Id: I50561bf6c88b491ec440d0c8385c74650f3c106e
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/plat/nvidia/tegra/include/tegra_private.h b/plat/nvidia/tegra/include/tegra_private.h
index b6f2df7..c4c277e 100644
--- a/plat/nvidia/tegra/include/tegra_private.h
+++ b/plat/nvidia/tegra/include/tegra_private.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __TEGRA_PRIVATE_H__
-#define __TEGRA_PRIVATE_H__
+#ifndef TEGRA_PRIVATE_H
+#define TEGRA_PRIVATE_H
 
 #include <arch.h>
 #include <platform_def.h>
@@ -112,4 +112,4 @@
 void tegra_secure_entrypoint(void);
 void tegra186_cpu_reset_handler(void);
 
-#endif /* __TEGRA_PRIVATE_H__ */
+#endif /* TEGRA_PRIVATE_H */