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/arm/css/sgm/include/sgm_base_platform_def.h b/plat/arm/css/sgm/include/sgm_base_platform_def.h
index 4ecfc96..f349c19 100644
--- a/plat/arm/css/sgm/include/sgm_base_platform_def.h
+++ b/plat/arm/css/sgm/include/sgm_base_platform_def.h
@@ -51,7 +51,7 @@
 
 /* Platform ID address */
 #define SSC_VERSION                     (SSC_REG_BASE + SSC_VERSION_OFFSET)
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 /* SSC_VERSION related accessors */
 /* Returns the part number of the platform */
 #define GET_PLAT_PART_NUM                                       \
@@ -59,7 +59,7 @@
 /* Returns the configuration number of the platform */
 #define GET_PLAT_CONFIG_NUM                                     \
 		GET_SSC_VERSION_CONFIG(mmio_read_32(SSC_VERSION))
-#endif /* __ASSEMBLY__ */
+#endif /* __ASSEMBLER__ */
 
 
 /*************************************************************************