configs: pandaboard: configure eth0 at startup

Now that we have modules (including usb/net) loaded automatically, we can
enable dhcp on eth0.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/pandaboard_defconfig

@@ -5,6 +5,7 @@ BR2_ARM_ENABLE_VFP=y
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_4=y
 BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttyO2"
+BR2_SYSTEM_DHCP="eth0"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="board/pandaboard/post-image.sh"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y