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/imx/common/include/imx8_lpuart.h b/plat/imx/common/include/imx8_lpuart.h
index 63449e7..0ea284f 100644
--- a/plat/imx/common/include/imx8_lpuart.h
+++ b/plat/imx/common/include/imx8_lpuart.h
@@ -50,7 +50,7 @@
 #define LPUART_BAUD_BOTHEDGE_MASK                (0x20000U)
 #define LPUART_BAUD_M10_MASK                     (0x20000000U)
 
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 
 #include <stdint.h>
 
@@ -61,6 +61,6 @@
 
 int console_lpuart_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud,
 			   console_lpuart_t *console);
-#endif /*__ASSEMBLY__*/
+#endif /*__ASSEMBLER__*/
 
 #endif /* IMX8_LPUART_H */