vending-machine: Use pure wayland graphics system

Note that poky is enabling wayland and opengl
(which are required), but xwayland is not needed
so let's remove x11 support.

Relate-to: https://git.ostc-eu.org/OSTC/planning/core-os/-/issues/226
Relate-to: https://git.ostc-eu.org/OSTC/planning/core-os/-/issues/222
Forwarded: https://git.ostc-eu.org/OSTC/OHOS/docs/-/merge_requests/192


Signed-off-by: Philippe Coval <philippe.coval@huawei.com>

meta-oniro-blueprints/conf/distro/oniro-linux-blueprint-vending-machine.conf

@@ -15,3 +15,6 @@ DISTRO_NAME = "Oniro Project Vending-Machine Blueprint Linux Distro"
 # mask out the blueprint layers in the main distro and unmask
 # them only the blueprint distributions.
 BBMASK = ""
+
+# Graphics system
+DISTRO_FEATURES_remove = "x11"