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/css/sds.h b/include/drivers/arm/css/sds.h
index 114ae92..db4cbaa 100644
--- a/include/drivers/arm/css/sds.h
+++ b/include/drivers/arm/css/sds.h
@@ -70,7 +70,7 @@
 #define SDS_ERR_STRUCT_NOT_FOUND	-3
 #define SDS_ERR_STRUCT_NOT_FINALIZED	-4
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 
@@ -85,6 +85,6 @@
 		size_t size, sds_access_mode_t mode);
 int sds_struct_write(uint32_t structure_id, unsigned int fld_off, void *data,
 		size_t size, sds_access_mode_t mode);
-#endif /*__ASSEMBLY__ */
+#endif /*__ASSEMBLER__ */
 
 #endif /* SDS_H */