openharmony-linux.conf: Bring back x11 for Epiphany support

Epiphany needs gcr while gcr needs x11 backend in gtk3+. That leads us
to the need of bringing x11 DISTRO_FEATURE back.

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

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

@@ -9,4 +9,4 @@ TCLIBC = "musl"
 INIT_MANAGER = "systemd"
 
 # Remove some of the default Poky DISTRO_FEATURES we inherited, but do not use.
-DISTRO_FEATURES_remove = "nfc 3g pcmcia x11"
+DISTRO_FEATURES_remove = "nfc 3g pcmcia"