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/lib/el3_runtime/aarch32/context.h b/include/lib/el3_runtime/aarch32/context.h
index 86ff53a..c5567c9 100644
--- a/include/lib/el3_runtime/aarch32/context.h
+++ b/include/lib/el3_runtime/aarch32/context.h
@@ -24,7 +24,7 @@
 #define CTX_NS_SCTLR		U(0x1C)
 #define CTX_REGS_END		U(0x20)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -65,6 +65,6 @@
 CASSERT(CTX_REGS_OFFSET == __builtin_offsetof(cpu_context_t, regs_ctx), \
 	assert_core_context_regs_offset_mismatch);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 #endif /* CONTEXT_H */