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/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index ec28db0..2adf11d 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -136,7 +136,7 @@
 #define SPIDEN_INT_CLR_SHIFT	6
 #define SPIDEN_SEL_SET_SHIFT	7
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 /* SSC_VERSION related accessors */
 
@@ -150,7 +150,7 @@
 		(((val) >> SSC_VERSION_CONFIG_SHIFT) &		\
 		SSC_VERSION_CONFIG_MASK)
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 /*************************************************************************
  * Required platform porting definitions common to all