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/hisilicon/hikey/include/hisi_pwrc.h b/plat/hisilicon/hikey/include/hisi_pwrc.h
index f1cc297..cbb4651 100644
--- a/plat/hisilicon/hikey/include/hisi_pwrc.h
+++ b/plat/hisilicon/hikey/include/hisi_pwrc.h
@@ -7,7 +7,7 @@
 #ifndef HISI_PWRC_H
 #define HISI_PWRC_H
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 void hisi_pwrc_set_cluster_wfi(unsigned int id);
 void hisi_pwrc_set_core_bx_addr(unsigned int core,
@@ -17,6 +17,6 @@
 			    unsigned int cluster);
 int hisi_pwrc_setup(void);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* HISI_PWRC_H */