[MIPS] Add CONFIG_32BIT to kernel_default_arch_macros for MIPS.
Some of the required structure definitons are defined under this macro.

Change-Id: I7a9a986e371381697dcb56bd8ea362856ffa7509
diff --git a/libc/kernel/arch-mips/asm/asmmacro.h b/libc/kernel/arch-mips/asm/asmmacro.h
index e1e9804..c42d45e 100644
--- a/libc/kernel/arch-mips/asm/asmmacro.h
+++ b/libc/kernel/arch-mips/asm/asmmacro.h
@@ -19,5 +19,6 @@
 #ifndef _ASM_ASMMACRO_H
 #define _ASM_ASMMACRO_H
 #include <asm/hazards.h>
-#endif
+#include <asm/asmmacro-32.h>
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif