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/services/arm_arch_svc.h b/include/services/arm_arch_svc.h
index 0d2f477..23c6f56 100644
--- a/include/services/arm_arch_svc.h
+++ b/include/services/arm_arch_svc.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __ARM_ARCH_SVC_H__
-#define __ARM_ARCH_SVC_H__
+#ifndef ARM_ARCH_SVC_H
+#define ARM_ARCH_SVC_H
 
 #define SMCCC_VERSION			U(0x80000000)
 #define SMCCC_ARCH_FEATURES		U(0x80000001)
@@ -14,4 +14,4 @@
 
 #define SMCCC_ARCH_NOT_REQUIRED		-2
 
-#endif /* __ARM_ARCH_SVC_H__ */
+#endif /* ARM_ARCH_SVC_H */
diff --git a/include/services/mm_svc.h b/include/services/mm_svc.h
index 7a8a3eb..ed2b324 100644
--- a/include/services/mm_svc.h
+++ b/include/services/mm_svc.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __MM_SVC_H__
-#define __MM_SVC_H__
+#ifndef MM_SVC_H
+#define MM_SVC_H
 
 #include <utils_def.h>
 
@@ -28,4 +28,4 @@
 #define MM_COMMUNICATE_AARCH64		U(0xC4000041)
 #define MM_COMMUNICATE_AARCH32		U(0x84000041)
 
-#endif /* __MM_SVC_H__ */
+#endif /* MM_SVC_H */
diff --git a/include/services/secure_partition.h b/include/services/secure_partition.h
index 8b0adc8..d565e0c 100644
--- a/include/services/secure_partition.h
+++ b/include/services/secure_partition.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __SECURE_PARTITION_H__
-#define __SECURE_PARTITION_H__
+#ifndef SECURE_PARTITION_H
+#define SECURE_PARTITION_H
 
 #include <stdint.h>
 #include <utils_def.h>
@@ -46,4 +46,4 @@
 	secure_partition_mp_info_t	*mp_info;
 } secure_partition_boot_info_t;
 
-#endif /* __SECURE_PARTITION_H__ */
+#endif /* SECURE_PARTITION_H */
diff --git a/include/services/spm_svc.h b/include/services/spm_svc.h
index 0200992..7a69b28 100644
--- a/include/services/spm_svc.h
+++ b/include/services/spm_svc.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __SPM_SVC_H__
-#define __SPM_SVC_H__
+#ifndef SPM_SVC_H
+#define SPM_SVC_H
 
 #include <utils_def.h>
 
@@ -79,4 +79,4 @@
 
 #endif /* __ASSEMBLY__ */
 
-#endif /* __SPM_SVC_H__ */
+#endif /* SPM_SVC_H */
diff --git a/include/services/std_svc.h b/include/services/std_svc.h
index 9fe70cc..b0614fb 100644
--- a/include/services/std_svc.h
+++ b/include/services/std_svc.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __STD_SVC_H__
-#define __STD_SVC_H__
+#ifndef STD_SVC_H
+#define STD_SVC_H
 
 /* SMC function IDs for Standard Service queries */
 
@@ -27,4 +27,4 @@
  */
 uintptr_t get_arm_std_svc_args(unsigned int svc_mask);
 
-#endif /* __STD_SVC_H__ */
+#endif /* STD_SVC_H */