add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot
..
..
@@ -3,3 +3,4 @@
3
3
 rcutree.gp_init_delay=3
4
4
 rcutree.gp_cleanup_delay=3
5
5
 rcutree.kthread_prio=2
6
+threadirqs