This commit removes all outdated OPTEE-OS recipes and synchronizes the Digi custom
.bbappend with the latest v4.0.0 from the ST BSP release, based on the
openstlinux-6.6-yocto-scarthgap-mpu-v24.11.06 tag for Yocto 5.0 (scarthgap).
https://onedigi.atlassian.net/browse/DEL-9381
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>