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/pl011.h b/include/drivers/arm/pl011.h
index f201f00..8733d19 100644
--- a/include/drivers/arm/pl011.h
+++ b/include/drivers/arm/pl011.h
@@ -83,7 +83,7 @@
 
 #define CONSOLE_T_PL011_BASE	CONSOLE_T_DRVDATA
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -101,6 +101,6 @@
 int console_pl011_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_pl011_t *console);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* PL011_H */