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/misc_regs.h b/plat/rockchip/rk3399/include/shared/misc_regs.h
index 02e001b..0160453 100644
--- a/plat/rockchip/rk3399/include/shared/misc_regs.h
+++ b/plat/rockchip/rk3399/include/shared/misc_regs.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __ROCKCHIP_RK3399_INCLUDE_SHARED_MISC_REGS_H__
-#define __ROCKCHIP_RK3399_INCLUDE_SHARED_MISC_REGS_H__
+#ifndef MISC_REGS_H
+#define MISC_REGS_H
 
 /* CRU */
 #define CRU_DPLL_CON0		0x40
@@ -24,4 +24,4 @@
 /* PMU CRU */
 #define PMU_CRU_GATEDIS_CON0	0x130
 
-#endif /* __ROCKCHIP_RK3399_INCLUDE_SHARED_MISC_REGS_H__ */
+#endif /* MISC_REGS_H */