Switch kernel header parsing to python libclang

Replace the tokenizer in cpp.py with libclang.

Bug: 18937958
Change-Id: I27630904c6d2849418cd5ca3d3c612ec3078686d
diff --git a/libc/kernel/uapi/asm-mips/asm/cachectl.h b/libc/kernel/uapi/asm-mips/asm/cachectl.h
index 6cc6f28..86cf3e4 100644
--- a/libc/kernel/uapi/asm-mips/asm/cachectl.h
+++ b/libc/kernel/uapi/asm-mips/asm/cachectl.h
@@ -18,10 +18,10 @@
  ****************************************************************************/
 #ifndef _ASM_CACHECTL
 #define _ASM_CACHECTL
-#define ICACHE (1<<0)
-#define DCACHE (1<<1)
+#define ICACHE (1 << 0)
+#define DCACHE (1 << 1)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-#define BCACHE (ICACHE|DCACHE)
+#define BCACHE (ICACHE | DCACHE)
 #define CACHEABLE 0
 #define UNCACHEABLE 1
 #endif