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/hisilicon/hikey/include/hi6220_regs_pin.h b/plat/hisilicon/hikey/include/hi6220_regs_pin.h
index 7de4c3c..05620ea 100644
--- a/plat/hisilicon/hikey/include/hi6220_regs_pin.h
+++ b/plat/hisilicon/hikey/include/hi6220_regs_pin.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __HI6220_PIN_H__
-#define __HI6220_PIN_H__
+#ifndef HI6220_REGS_PIN_H
+#define HI6220_REGS_PIN_H
 
 #define IOMG_BASE				0xF7010000
 
@@ -40,4 +40,4 @@
 #define IOCG_PULLDOWN				(1 << 1)
 #define IOCG_PULLUP				(1 << 0)
 
-#endif	/* __HI6220_PIN_H__ */
+#endif /* HI6220_REGS_PIN_H */