hwdb: ieee1394-unit-function: add entry for AV/C device with generic AV/C command set

hwdb: ieee1394-unit-function: add entry for AV/C device with generic AV/C command set

Typical node of AV/C device has standard content of configuration ROM.
This is defined in documentation of 1394 Trading Association.

 * Configuration ROM for AV/C Devices 1.0 (Dec. 12, 2000, 1394 Trading
   Association, TA Document 1999027)

However, it brings an issue that the functions in AV/C device are not
distinguished just by the content of configuration ROM.

In former commit, hardware database was added to describe function type
of unit in the node, then udev rules are added to utilize the database.

However, we have an request to obsolete existent udev rules by putting
enough entries to the database. It should be done carefully.

This commit adds entry into hardware database just for backward
compatibility. The entry can match to some node and unit unexpectedly.
Therefore this commit modifies existent entries to invalidate the effect
from added entry.

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