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/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index 3853319..4a7d314 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __CSS_DEF_H__
-#define __CSS_DEF_H__
+#ifndef CSS_DEF_H
+#define CSS_DEF_H
 
 #include <arm_def.h>
 #include <gic_common.h>
@@ -200,4 +200,4 @@
 #define CSS_CPU_PWR_STATE_OFF		0
 #define CSS_CPU_PWR_STATE(state, n)	(((state) >> (n)) & 1)
 
-#endif /* __CSS_DEF_H__ */
+#endif /* CSS_DEF_H */