hwdb: add database entries for node with multiple units

hwdb: add database entries for node with multiple units

In IEEE 1394 bus, one node can include multiple units, which represent
certain functions such as video and audio. Although it's possible to
distinguish each unit, Linux FireWire character device corresponding to
the node can not have multiple group owners, therefore it's forced to
select one of the units as representative for function.

This commit adds database entries for units belongs to the same node.
The entries are aligned to inverse order of corresponding unit order
in configuration ROM to select the first unit as the representative.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>