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/imx/timer/imx_gpt.h b/drivers/imx/timer/imx_gpt.h
index 6416c3c..2432633 100644
--- a/drivers/imx/timer/imx_gpt.h
+++ b/drivers/imx/timer/imx_gpt.h
@@ -4,11 +4,11 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __IMX_GPT_H__
-#define __IMX_GPT_H__
+#ifndef IMX_GPT_H
+#define IMX_GPT_H
 
 #include <stdint.h>
 
 void imx_gpt_ops_init(uintptr_t reg_base);
 
-#endif /* __IMX_GPT_H__ */
+#endif /* IMX_GPT_H */