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/drivers/arm/pl061_gpio.h b/include/drivers/arm/pl061_gpio.h
index 971a23d..6c4a9f5 100644
--- a/include/drivers/arm/pl061_gpio.h
+++ b/include/drivers/arm/pl061_gpio.h
@@ -4,12 +4,12 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __PL061_GPIO_H__
-#define __PL061_GPIO_H__
+#ifndef PL061_GPIO_H
+#define PL061_GPIO_H
 
 #include <gpio.h>
 
 void pl061_gpio_register(uintptr_t base_addr, int gpio_dev);
 void pl061_gpio_init(void);
 
-#endif	/* __PL061_GPIO_H__ */
+#endif /* PL061_GPIO_H */