rootfs: delete sys-kernel-config.mount

This mount was not functional due to missing CONFIG_CONFIGFS_FS in the
Guest kernel.

Deleting sys-kernel-config.mount also disables modprobe@configfs.service.

Signed-off-by: Dan Mihai <dmihai@microsoft.com>

tools/osbuilder/rootfs-builder/rootfs.sh

@@ -50,6 +50,7 @@ TARGET_OS=${TARGET_OS:-linux}
 readonly -a systemd_units=(
 	"blk-availability"
 	"sys-fs-fuse-connections"
+	"sys-kernel-config"
 	"systemd-ask-password-console"
 	"systemd-ask-password-wall"
 	"systemd-boot-update"