Update sysutils/dsbmd to 1.2

Changes

• An unmount_on_exit variable has been added. It controls whether and how a filesystem mounted by DSBMD shall be unmounted on exit.

• A bug where md, ada and mmcsd devices were not detected (introduced in version 1.0) has been fixed.

• A bug where a mounted daX (X > 0) device was not detected on startup has been fixed.

PR: 225825
Submitted by: Marcel Kaiser <mk@nic-nac-project.org> (maintainer)