remove duplicate code

Merge pull request RT-Thread#5448 from cndabai/changelog

add change log for v4.0.5

[update] add v4.0.4 changelog

Merge pull request RT-Thread#4737 from mysterywolf/3,1,xformat

[lts 3.1.x] format codes

Merge pull request RT-Thread#4215 from Guozhanxin/changelog

Update ChangeLog.md

Merge pull request RT-Thread#3594 from armink/lts-v3.1.x

update change log.

Merge pull request RT-Thread#3279 from armink/fix_rbb

[DeviceDriver][IPC] Fix rbb free bug in rt_rbb_destroy.

[Kernel] code cleanup for rt_schedule

Update ChangeLog.md

Merge pull request RT-Thread#2289 from armink/lts-v3.1.x

Lts v3.1.x