Fix part ID response format

Part ID response format is probably hexidecimal.

lpc.c

@@ -102,7 +102,7 @@ int lpc_read_partid(struct lpc_device *dev) {
   res = lpc_command("J\r\n");
   if(res!=0)
     return res;
-  scanf("%u\r\n", &partid);
+  scanf("0x%x\r\n", &partid);
   for(i=0; lpc_parts[i].name; i++)
     if(lpc_parts[i].part_id==partid)
       break;