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/common/aarch32/assert_macros.S b/include/common/aarch32/assert_macros.S
index c958810..ab3a2eb 100644
--- a/include/common/aarch32/assert_macros.S
+++ b/include/common/aarch32/assert_macros.S
@@ -3,8 +3,8 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
-#ifndef __ASSERT_MACROS_S__
-#define __ASSERT_MACROS_S__
+#ifndef ASSERT_MACROS_S
+#define ASSERT_MACROS_S
 
 	/*
 	 * Assembler macro to enable asm_assert. We assume that the stack is
@@ -23,4 +23,4 @@
 	b	asm_assert;\
 300:
 
-#endif /* __ASSERT_MACROS_S__ */
+#endif /* ASSERT_MACROS_S */