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/staging/renesas/rcar/pfc/E3/pfc_init_e3.h b/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.h
index 041a778..647a937 100644
--- a/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.h
+++ b/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef PFC_INIT_E3_H__
-#define PFC_INIT_E3_H__
+#ifndef PFC_INIT_E3_H
+#define PFC_INIT_E3_H
 
 void pfc_init_e3(void);
 
-#endif /* PFC_INIT_E3_H__ */
+#endif /* PFC_INIT_E3_H */
diff --git a/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v1.h b/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v1.h
index 844c1b9..2478e1c 100644
--- a/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v1.h
+++ b/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v1.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef PFC_INIT_H3_V1_H__
-#define PFC_INIT_H3_V1_H__
+#ifndef PFC_INIT_H3_V1_H
+#define PFC_INIT_H3_V1_H
 
 void pfc_init_h3_v1(void);
 
-#endif /* PFC_INIT_H3_V1_H__ */
+#endif /* PFC_INIT_H3_V1_H */
diff --git a/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v2.h b/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v2.h
index 3f691f8..b02f93e 100644
--- a/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v2.h
+++ b/drivers/staging/renesas/rcar/pfc/H3/pfc_init_h3_v2.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef PFC_INIT_H3_V2_H__
-#define PFC_INIT_H3_V2_H__
+#ifndef PFC_INIT_H3_V2_H
+#define PFC_INIT_H3_V2_H
 
 void pfc_init_h3_v2(void);
 
-#endif /* PFC_INIT_H3_V2_H__ */
+#endif /* PFC_INIT_H3_V2_H */
diff --git a/drivers/staging/renesas/rcar/pfc/M3/pfc_init_m3.h b/drivers/staging/renesas/rcar/pfc/M3/pfc_init_m3.h
index c6ee693..70885de 100644
--- a/drivers/staging/renesas/rcar/pfc/M3/pfc_init_m3.h
+++ b/drivers/staging/renesas/rcar/pfc/M3/pfc_init_m3.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef PFC_INIT_M3_H__
-#define PFC_INIT_M3_H__
+#ifndef PFC_INIT_M3_H
+#define PFC_INIT_M3_H
 
 void pfc_init_m3(void);
 
-#endif /* PFC_INIT_M3_H__ */
+#endif /* PFC_INIT_M3_H */
diff --git a/drivers/staging/renesas/rcar/pfc/M3N/pfc_init_m3n.h b/drivers/staging/renesas/rcar/pfc/M3N/pfc_init_m3n.h
index 9e08e58..3e6f879 100644
--- a/drivers/staging/renesas/rcar/pfc/M3N/pfc_init_m3n.h
+++ b/drivers/staging/renesas/rcar/pfc/M3N/pfc_init_m3n.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef PFC_INIT_M3N_H__
-#define PFC_INIT_M3N_H__
+#ifndef PFC_INIT_M3N_H
+#define PFC_INIT_M3N_H
 
 void pfc_init_m3n(void);
 
-#endif /* PFC_INIT_M3N_H__ */
+#endif /* PFC_INIT_M3N_H */