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/drivers/arm/cci.h b/include/drivers/arm/cci.h
index c5ddcfd..5aea95a 100644
--- a/include/drivers/arm/cci.h
+++ b/include/drivers/arm/cci.h
@@ -100,7 +100,7 @@
 
 #define SLAVE_IF_UNUSED			-1
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -121,5 +121,5 @@
 void cci_enable_snoop_dvm_reqs(unsigned int master_id);
 void cci_disable_snoop_dvm_reqs(unsigned int master_id);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* CCI_H */