[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/mach-generic/spaces.h b/libc/kernel/arch-mips/asm/mach-generic/spaces.h
index cbda237..0ec1f57 100644
--- a/libc/kernel/arch-mips/asm/mach-generic/spaces.h
+++ b/libc/kernel/arch-mips/asm/mach-generic/spaces.h
@@ -23,8 +23,19 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define PHYS_OFFSET _AC(0, UL)
 #endif
-#ifndef PAGE_OFFSET
-#define PAGE_OFFSET (CAC_BASE + PHYS_OFFSET)
+#define CAC_BASE _AC(0x80000000, UL)
+#define IO_BASE _AC(0xa0000000, UL)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define UNCAC_BASE _AC(0xa0000000, UL)
+#ifndef MAP_BASE
+#define MAP_BASE _AC(0xc0000000, UL)
+#endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#ifndef HIGHMEM_START
+#define HIGHMEM_START _AC(0x20000000, UL)
+#endif
+#ifndef PAGE_OFFSET
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PAGE_OFFSET (CAC_BASE + PHYS_OFFSET)
 #endif
 #endif