openharmony-zephyr.conf: Introduce zephyr distro config

Add OpenHarmony wrapper for the Zephyr distro config.
This doesn't add any functionality on top of zephyr.conf
but rather aligns it with openharmony-linux distro naming
convention. DISTRO_VERSION is same as its Linux counterpart.

Signed-off-by: Zbigniew Bodek <zbigniew.bodek@huawei.com>

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

+require conf/distro/zephyr.conf
+
+DISTRO = "openharmony-zephyr"
+DISTRO_NAME = "OpenHarmony Base Zephyr Distro"
+DISTRO_VERSION = "0.1"