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/services/spd/tspd/tspd_private.h b/services/spd/tspd/tspd_private.h
index 50f3b87..a81eb21 100644
--- a/services/spd/tspd/tspd_private.h
+++ b/services/spd/tspd/tspd_private.h
@@ -126,7 +126,7 @@
 #define TSPD_SP_CTX_SIZE	0x90
 #define TSPD_SP_CTX_ENTRIES		(TSPD_SP_CTX_SIZE >> DWORD_SHIFT)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -227,6 +227,6 @@
 
 extern tsp_context_t tspd_sp_context[TSPD_CORE_COUNT];
 extern tsp_vectors_t *tsp_vectors;
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* TSPD_PRIVATE_H */