x86: crownbay: Enable Intel E1000 NIC support

We don't have driver for the Intel Topcliff PCH Gigabit Ethernet
controller for now, so enable the Intle E1000 NIC support, which
can be plugged into any PCIe slot on the Crown Bay board.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>