Replace __ASSEMBLY__ with compiler-builtin __ASSEMBLER__

NOTE: __ASSEMBLY__ macro is now deprecated in favor of __ASSEMBLER__.

All common C compilers predefine a macro called __ASSEMBLER__ when
preprocessing a .S file. There is no reason for TF-A to define it's own
__ASSEMBLY__ macro for this purpose instead. To unify code with the
export headers (which use __ASSEMBLER__ to avoid one extra dependency),
let's deprecate __ASSEMBLY__ and switch the code base over to the
predefined standard.

Change-Id: Id7d0ec8cf330195da80499c68562b65cb5ab7417
Signed-off-by: Julius Werner <jwerner@chromium.org>
diff --git a/include/common/bl_common.h b/include/common/bl_common.h
index eb96df0..896a03f 100644
--- a/include/common/bl_common.h
+++ b/include/common/bl_common.h
@@ -11,11 +11,11 @@
 #include <common/param_header.h>
 #include <lib/utils_def.h>
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 #include <lib/cassert.h>
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #include <export/common/bl_common_exp.h>
 
@@ -91,7 +91,7 @@
 #define __TEXT_END__			Load$$__TEXT_EPILOGUE__$$Base
 #endif /* USE_ARM_LINK */
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /*
  * Declarations of linker defined symbols to help determine memory layout of
@@ -178,6 +178,6 @@
 
 void bl_handle_pauth(void);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* BL_COMMON_H */