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/rpi3/include/platform_def.h b/plat/rpi3/include/platform_def.h
index 76a5ff4..7122401 100644
--- a/plat/rpi3/include/platform_def.h
+++ b/plat/rpi3/include/platform_def.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __PLATFORM_DEF_H__
-#define __PLATFORM_DEF_H__
+#ifndef PLATFORM_DEF_H
+#define PLATFORM_DEF_H
 
 #include <arch.h>
 #include <common_def.h>
@@ -236,4 +236,4 @@
  */
 #define SYS_COUNTER_FREQ_IN_TICKS	ULL(19200000)
 
-#endif /* __PLATFORM_DEF_H__ */
+#endif /* PLATFORM_DEF_H */
diff --git a/plat/rpi3/rpi3_hw.h b/plat/rpi3/rpi3_hw.h
index 1a26053..822644c 100644
--- a/plat/rpi3/rpi3_hw.h
+++ b/plat/rpi3/rpi3_hw.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __RPI3_HW__
-#define __RPI3_HW__
+#ifndef RPI3_HW_H
+#define RPI3_HW_H
 
 #include <utils_def.h>
 
@@ -95,4 +95,4 @@
 #define RPI3_INTC_PENDING_FIQ_OFFSET		ULL(0x00000070)
 #define RPI3_INTC_PENDING_FIQ_MBOX3		ULL(0x00000080)
 
-#endif /* __RPI3_HW__ */
+#endif /* RPI3_HW_H */
diff --git a/plat/rpi3/rpi3_private.h b/plat/rpi3/rpi3_private.h
index 368d09b..53078f8 100644
--- a/plat/rpi3/rpi3_private.h
+++ b/plat/rpi3/rpi3_private.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __RPI3_PRIVATE_H__
-#define __RPI3_PRIVATE_H__
+#ifndef RPI3_PRIVATE_H
+#define RPI3_PRIVATE_H
 
 #include <stdint.h>
 
@@ -39,4 +39,4 @@
 /* VideoCore firmware commands */
 int rpi3_vc_hardware_get_board_revision(uint32_t *revision);
 
-#endif /*__RPI3_PRIVATE_H__ */
+#endif /* RPI3_PRIVATE_H */