Add udev rule for drbcc. HYP-7965

udev is provided by systemd (not by the recipe in
openembedded-core/meta/recipes-core/udev).

Therefore, systemd has been appended to install hipos.rules.
This results in mapping ttyUSB0 to /dev/ttydrbcc. This new entry
should be used for communication with drbcc.

Signed-off-by: Angelika Tobisch <tobisch@dresearch-fe.de>