lvgl: bump version to v8.2.0

This backports the changes scheduled to be released with Zephyr v3.1.0
to the oniro meta-zephyr fork.

The changes are a minimal subset of the upstream 4000+ LOC changes that
allow us to work with the Zephyr LVGL fork updated to v8.2.0.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@huawei.com>