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/drivers/mentor/mi2cv.h b/include/drivers/mentor/mi2cv.h
index 6b03ed7..85b733b 100644
--- a/include/drivers/mentor/mi2cv.h
+++ b/include/drivers/mentor/mi2cv.h
@@ -8,8 +8,8 @@
 
 /* This driver provides support for Mentor Graphics MI2CV IP core */
 
-#ifndef _MI2CV_H_
-#define _MI2CV_H_
+#ifndef MI2CV_H
+#define MI2CV_H
 
 #include <stdint.h>
 
@@ -36,4 +36,5 @@
 
 int i2c_write(uint8_t chip,
 	      unsigned int addr, int alen, uint8_t *buffer, int len);
-#endif
+
+#endif /* MI2CV_H */