de6*/dl2k/sundance: Move the D-Link drivers

Move the D-Link drivers into drivers/net/ethernet/dlink/ and
make the necessary Kconfig and Makefile changes.

CC: Bjorn Ekwall <bj0rn@blox.se>
CC: Donald Becker <becker@scyld.com>
CC: Edward Peng <edward_peng@dlink.com.tw>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>