init: Add support for specifying a services i/o priority

Signed-off-by: San Mehat <san@google.com>
diff --git a/init/init.h b/init/init.h
index 60c3055..8c0571c 100644
--- a/init/init.h
+++ b/init/init.h
@@ -146,6 +146,9 @@
     int nkeycodes;
     int keychord_id;
 
+    int ioprio_class;
+    int ioprio_pri;
+
     int nargs;
     /* "MUST BE AT THE END OF THE STRUCT" */
     char *args[1];