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/drivers/renesas/rcar/emmc/emmc_config.h b/drivers/renesas/rcar/emmc/emmc_config.h
index 16dcea1..686ccb9 100644
--- a/drivers/renesas/rcar/emmc/emmc_config.h
+++ b/drivers/renesas/rcar/emmc/emmc_config.h
@@ -10,8 +10,8 @@
  *
  */
 
-#ifndef __EMMC_CONFIG_H__
-#define __EMMC_CONFIG_H__
+#ifndef EMMC_CONFIG_H
+#define EMMC_CONFIG_H
 
 /* ************************ HEADER (INCLUDE) SECTION *********************** */
 
@@ -36,5 +36,5 @@
 
 /* ********************************* CODE ********************************** */
 
-#endif /* #ifndef __EMMC_CONFIG_H__ */
+#endif /* EMMC_CONFIG_H */
 /* ******************************** END ************************************ */
diff --git a/drivers/renesas/rcar/emmc/emmc_def.h b/drivers/renesas/rcar/emmc/emmc_def.h
index 2944515..178c795 100644
--- a/drivers/renesas/rcar/emmc/emmc_def.h
+++ b/drivers/renesas/rcar/emmc/emmc_def.h
@@ -10,8 +10,8 @@
  *
  */
 
-#ifndef __EMMC_DEF_H__
-#define __EMMC_DEF_H__
+#ifndef EMMC_DEF_H
+#define EMMC_DEF_H
 
 #include "emmc_std.h"
 
@@ -74,5 +74,5 @@
 
 /* ********************************* CODE ********************************** */
 
-#endif /* #define __EMMC_DEF_H__ */
+#endif /* EMMC_DEF_H */
 /* ******************************** END ************************************ */
diff --git a/drivers/renesas/rcar/emmc/emmc_hal.h b/drivers/renesas/rcar/emmc/emmc_hal.h
index 633446c..f0b7e9d 100644
--- a/drivers/renesas/rcar/emmc/emmc_hal.h
+++ b/drivers/renesas/rcar/emmc/emmc_hal.h
@@ -10,8 +10,8 @@
  *
  */
 
-#ifndef __EMMC_HAL_H__
-#define __EMMC_HAL_H__
+#ifndef EMMC_HAL_H
+#define EMMC_HAL_H
 /* ************************ HEADER (INCLUDE) SECTION *********************** */
 #include <stdint.h>
 /* ***************** MACROS, CONSTANTS, COMPILATION FLAGS ****************** */
@@ -313,6 +313,6 @@
 
 /* ********************************* CODE ********************************** */
 
-#endif /* __EMMC_HAL_H__ */
+#endif /* EMMC_HAL_H */
 
 /* ******************************** END ************************************ */
diff --git a/drivers/renesas/rcar/emmc/emmc_registers.h b/drivers/renesas/rcar/emmc/emmc_registers.h
index a670ab7..55ff33d 100644
--- a/drivers/renesas/rcar/emmc/emmc_registers.h
+++ b/drivers/renesas/rcar/emmc/emmc_registers.h
@@ -10,8 +10,8 @@
  *
  */
 
-#ifndef __EMMC_REGISTERS_H__
-#define __EMMC_REGISTERS_H__
+#ifndef EMMC_REGISTERS_H
+#define EMMC_REGISTERS_H
 
 /* ************************ HEADER (INCLUDE) SECTION *********************** */
 
@@ -256,5 +256,5 @@
 
 /* ********************************* CODE ********************************** */
 
-#endif /* __EMMC_REGISTERS_H__ */
+#endif /* EMMC_REGISTERS_H */
 /* ******************************** END ************************************ */
diff --git a/drivers/renesas/rcar/emmc/emmc_std.h b/drivers/renesas/rcar/emmc/emmc_std.h
index f4ce198..99cb6b9 100644
--- a/drivers/renesas/rcar/emmc/emmc_std.h
+++ b/drivers/renesas/rcar/emmc/emmc_std.h
@@ -10,8 +10,8 @@
  *
  */
 
-#ifndef __EMMC_STD_H__
-#define __EMMC_STD_H__
+#ifndef EMMC_STD_H
+#define EMMC_STD_H
 
 #include "emmc_hal.h"
 
@@ -471,4 +471,4 @@
 /* ********************************* CODE ********************************** */
 
 /* ******************************** END ************************************ */
-#endif /* __EMMC_STD_H__ */
+#endif /* EMMC_STD_H */