allscenarios-linux.conf: Revert enable optee in distribution"

The optee DISTRO_FEATURE seems to only be used in
https://github.com/STMicroelectronics/meta-st-openstlinux

 which we don't
pull in our setup as of now. Drop this change to avoid confusion.

This reverts commit 229e09c3.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-core/conf/distro/allscenarios-linux.conf

@@ -16,7 +16,6 @@ INIT_MANAGER = "systemd"
 
 # Remove some of the default Poky DISTRO_FEATURES we inherited, but do not use.
 DISTRO_FEATURES_remove = "nfc 3g pcmcia"
-DISTRO_FEATURES_append = " optee"
 
 PREFERRED_VERSION_linux-yocto = "5.10%"