docs(changelog): changelog for lts-v2.8.11 release

Generated with the command:
npm run release -- --release-as 2.8.11

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I5fc96f3a21bfa0b2d450b37ab1425f9d8f4d441c
7 files changed