[PATCH v2] Add support for the more recent Davicom DM9000A and DM9000

[Juergen Beisert]

The current Davicom DM9000 support covers the DM9000E device only. This patch
series adds support of for the more recent DM9000A and DM9000B variants.
The DM9000E variant is still supported.

Tested on Mini2440 and scb9328 with the DM9000E variant and Mini6410 with the
DM9000A variant.

This is v2 of the patch series, as the first one has forgotten to switch all
users of the existing DM9000 driver to the new one.

Comments are welcome.