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/mediatek/mt6795/include/scu.h b/plat/mediatek/mt6795/include/scu.h
index 3c78692..625418a 100644
--- a/plat/mediatek/mt6795/include/scu.h
+++ b/plat/mediatek/mt6795/include/scu.h
@@ -4,10 +4,10 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __SCU_H__
-#define __SCU_H__
+#ifndef SCU_H
+#define SCU_H
 
 void disable_scu(unsigned long mpidr);
 void enable_scu(unsigned long mpidr);
 
-#endif
+#endif /* SCU_H */