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/renesas/rcar/include/registers/lifec_registers.h b/plat/renesas/rcar/include/registers/lifec_registers.h
index b331be3..de78760 100644
--- a/plat/renesas/rcar/include/registers/lifec_registers.h
+++ b/plat/renesas/rcar/include/registers/lifec_registers.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef	LIFEC_REGISTER_H__
-#define	LIFEC_REGISTER_H__
+#ifndef LIFEC_REGISTERS_H
+#define LIFEC_REGISTERS_H
 
 #define	LIFEC_SEC_BASE	(0xE6110000U)
 
@@ -141,4 +141,4 @@
 #define	SAFE_READONLY14	(LIFEC_SAFE_BASE + 0x0210U)
 #define	SAFE_READONLY15	(LIFEC_SAFE_BASE + 0x0214U)
 
-#endif
+#endif /* LIFEC_REGISTERS_H */