misc: respect standard __ASSEMBLER__ define in CPU headers

The JZ47xx and S5L87xx processor families used their own
special defines (__ASSEMBLY__ and ASM respectively) in
their CPU headers to check if they were included from an
assembly source file.

For GCC the standard seems to be __ASSEMBLER__, so check
for that instead and remove the non-standard symbols.
Being more consistent across platforms makes it easier to
include cpu.h from cross-platform files (eg. plugin.lds).

Change-Id: I282930cad34e1a2ff18166f3b4338548b34f4a49

utils/hwstub/stub/jz4760b/jz4760b.h

@@ -15,7 +15,7 @@
 #ifndef __JZ4760B_H__
 #define __JZ4760B_H__
 
-#if defined(__ASSEMBLY__) || defined(__LANGUAGE_ASSEMBLY)
+#if defined(__ASSEMBLER__)
         #ifndef __MIPS_ASSEMBLER
                 #define __MIPS_ASSEMBLER
         #endif

utils/mks5lboot/dualboot/dualboot.lds

@@ -1,4 +1,4 @@
-#define ASM
+#define __ASSEMBLER__
 #include "config.h"
 #include "cpu.h"
 #include "mks5lboot.h"

utils/mks5lboot/mks5lboot.h

@@ -30,7 +30,7 @@
 #define BIN_OFFSET      (CERT_OFFSET + ((CERT_SIZE + 0x3) & ~ 0x3))
 #define MAX_PAYLOAD     (DFU_MAXSIZE - BIN_OFFSET)
 
-#ifndef ASM
+#ifndef __ASSEMBLER__
 #include <stddef.h>
 #include <stdint.h>
 
@@ -124,6 +124,6 @@ void ipoddfu_debug(int debug);
 #ifdef __cplusplus
 };
 #endif
-#endif /* ASM */
+#endif /* __ASSEMBLER__ */
 
 #endif /* __MK6GBOOT_H__ */