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/rockchip/rk3399/include/shared/bl31_param.h b/plat/rockchip/rk3399/include/shared/bl31_param.h
index 85a0f4a..e7f2226 100644
--- a/plat/rockchip/rk3399/include/shared/bl31_param.h
+++ b/plat/rockchip/rk3399/include/shared/bl31_param.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __PLAT_ROCKCHIP_RK3399_INCLUDE_SHARED_BL31_PARAM_H__
-#define __PLAT_ROCKCHIP_RK3399_INCLUDE_SHARED_BL31_PARAM_H__
+#ifndef BL31_PARAM_H
+#define BL31_PARAM_H
 
 /*******************************************************************************
  * Platform memory map related constants
@@ -18,9 +18,9 @@
  * BL31 specific defines.
  ******************************************************************************/
 /*
- * Put BL3-1 at the top of the Trusted RAM
+ * Put BL31 at the top of the Trusted RAM
  */
 #define BL31_BASE		(TZRAM_BASE + 0x1000)
 #define BL31_LIMIT		(TZRAM_BASE + TZRAM_SIZE)
 
-#endif /*__PLAT_ROCKCHIP_RK3399_INCLUDE_SHARED_BL31_PARAM_H__*/
+#endif /* BL31_PARAM_H */