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/imx/imx7/include/imx_hab_arch.h b/plat/imx/imx7/include/imx_hab_arch.h
index 338a027..2a34c6a 100644
--- a/plat/imx/imx7/include/imx_hab_arch.h
+++ b/plat/imx/imx7/include/imx_hab_arch.h
@@ -3,10 +3,10 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
-#ifndef __IMX_HAB_ARCH_H__
-#define __IMX_HAB_ARCH_H__
+#ifndef IMX_HAB_ARCH_H
+#define IMX_HAB_ARCH_H
 
 /* Define the offset the High Assurance Boot callback table is at */
 #define HAB_CALLBACK_OFFSET	0x100
 
-#endif /* __IMX_HAB_ARCH_H__ */
+#endif /* IMX_HAB_ARCH_H */
diff --git a/plat/imx/imx7/include/imx_regs.h b/plat/imx/imx7/include/imx_regs.h
index aa345cf..3c7e20f 100644
--- a/plat/imx/imx7/include/imx_regs.h
+++ b/plat/imx/imx7/include/imx_regs.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __IMX_REGS_H__
-#define __IMX_REGS_H__
+#ifndef IMX_REGS_H
+#define IMX_REGS_H
 
 /* Define the processor memory map */
 
@@ -105,4 +105,4 @@
 /* Define the maximum number of WDOG blocks on this SoC */
 #define MXC_MAX_WDOG_NUM		0x04
 
-#endif /* __IMX_REGS_H__ */
+#endif /* IMX_REGS_H */
diff --git a/plat/imx/imx7/warp7/include/platform_def.h b/plat/imx/imx7/warp7/include/platform_def.h
index 27429c7..d0148f4 100644
--- a/plat/imx/imx7/warp7/include/platform_def.h
+++ b/plat/imx/imx7/warp7/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>
@@ -214,4 +214,4 @@
  */
 #define SYS_COUNTER_FREQ_IN_TICKS	8000000		/* 8 MHz */
 
-#endif /* __PLATFORM_DEF_H__ */
+#endif /* PLATFORM_DEF_H */
diff --git a/plat/imx/imx7/warp7/warp7_private.h b/plat/imx/imx7/warp7/warp7_private.h
index c93acac..cb6d900 100644
--- a/plat/imx/imx7/warp7/warp7_private.h
+++ b/plat/imx/imx7/warp7/warp7_private.h
@@ -4,12 +4,12 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __WARP7_PRIVATE_H__
-#define __WARP7_PRIVATE_H__
+#ifndef WARP7_PRIVATE_H
+#define WARP7_PRIVATE_H
 
 /*******************************************************************************
  * Function and variable prototypes
  ******************************************************************************/
 void plat_warp7_io_setup(void);
 
-#endif /*__WARP7_PRIVATE_H__ */
+#endif /* WARP7_PRIVATE_H */