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/drivers/renesas/rcar/delay/micro_delay.h b/drivers/renesas/rcar/delay/micro_delay.h
index 193daba..37b71f8 100644
--- a/drivers/renesas/rcar/delay/micro_delay.h
+++ b/drivers/renesas/rcar/delay/micro_delay.h
@@ -7,7 +7,7 @@
 #ifndef MICRO_DELAY_H
 #define MICRO_DELAY_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <stdint.h>
 void rcar_micro_delay(uint64_t micro_sec);
 #endif