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/linux/serial_reg.h b/libc/kernel/uapi/linux/serial_reg.h
index 71063ec..f68c54b 100644
--- a/libc/kernel/uapi/linux/serial_reg.h
+++ b/libc/kernel/uapi/linux/serial_reg.h
@@ -77,7 +77,7 @@
 #define UART_FCR7_64BYTE 0x20
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define UART_FCR_R_TRIG_SHIFT 6
-#define UART_FCR_R_TRIG_BITS(x)   (((x) & UART_FCR_TRIGGER_MASK) >> UART_FCR_R_TRIG_SHIFT)
+#define UART_FCR_R_TRIG_BITS(x) (((x) & UART_FCR_TRIGGER_MASK) >> UART_FCR_R_TRIG_SHIFT)
 #define UART_FCR_R_TRIG_MAX_STATE 4
 #define UART_LCR 3
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
@@ -243,7 +243,7 @@
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define UART_ACR_ICRRD 0x40
 #define UART_ACR_ASREN 0x80
-#define UART_RSA_BASE (-8)
+#define UART_RSA_BASE (- 8)
 #define UART_RSA_MSR ((UART_RSA_BASE) + 0)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #define UART_RSA_MSR_SWAP (1 << 0)