rtl8180_dev.c: add support for 1799:700f

I have been using the rtl8180 driver via the git kernel route for a while now and would like to suggest that the following local ammendment is included in the development tree in order to support the PCI device 1799:700f.

This device is found on the 'Belkin Wireless G Desktop Card' product, model 'F5D7000uk'.  From memory, the chip on the card is inscribed RTL8185L;  (I don't know the significance of the 'L', I'm afraid).

Signed-off-by: Adrian Bassett <adrian.bassett@hotmail.co.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>