This adds support for zephyr v3.1.0. It's not a backport from upstream
as meta-zephyr master branch build is still broken as of writing this.

There are several incompatible changes between v3.0 and v3.1 that require
us to use separate patches for the ACM console. Other patches needed
to be moved around between version too - when we drop v2.7 and v3.0, it
will become much cleaner.

On the flip side: lvgl is now upstream so v3.1 doesn't need the lvgl
backports. On the flip flip side we need special handling of the DSHIELD
option for lvgl as long as we support both v3 versions.

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