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/bl31/interrupt_mgmt.h b/include/bl31/interrupt_mgmt.h
index b1683cc..8bb1bab 100644
--- a/include/bl31/interrupt_mgmt.h
+++ b/include/bl31/interrupt_mgmt.h
@@ -79,7 +79,7 @@
 #define get_interrupt_src_ss(flag)	(((flag) >> INTR_SRC_SS_FLAG_SHIFT) & \
 					 INTR_SRC_SS_FLAG_MASK)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <errno.h>
 #include <stdint.h>
@@ -143,5 +143,5 @@
 int disable_intr_rm_local(uint32_t type, uint32_t security_state);
 int enable_intr_rm_local(uint32_t type, uint32_t security_state);
 
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 #endif /* INTERRUPT_MGMT_H */