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/plat/mediatek/mt8183/drivers/mcsi/mcsi.h b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
index 8a588bf..863e7da 100644
--- a/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
+++ b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
@@ -85,7 +85,7 @@
 
 #define CCI_CLK_CTRL			(MCUCFG_BASE + 0x660)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <plat/common/common_def.h>
 #include <stdint.h>
@@ -112,5 +112,5 @@
 void cci_init_sf(void);
 unsigned long cci_reg_access(unsigned int op, unsigned long offset, unsigned long val);
 
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 #endif /* MCSI_H */