oniro-linux.conf: Include DISTRO as part of the hostname

This gives a bit more clarity on what is running on a system without
sacrificing on flexibility.

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

meta-oniro-core/conf/distro/oniro-linux.conf

@@ -120,3 +120,6 @@ IMAGE_LOG_CHECK_EXCLUDES:libc-musl += "Failed opening /etc/nsswitch.conf"
 # We run a read-only rootfs but we want shadow because it includes subid
 # configuration used by podman in rootless mode.
 ROOTFS_RO_UNNEEDED:remove = "shadow"
+
+# Set default hostname to reflect the DISTRO
+hostname:pn-base-files = "${DISTRO}-${MACHINE}"