net: Move CONFIG_E1000 options to Kconfig

Move config for the E1000 Ethernet driver to Kconfig and tidy up affected
boards.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/apalis_t30_defconfig b/configs/apalis_t30_defconfig
index c0bc3c5..c0830db 100644
--- a/configs/apalis_t30_defconfig
+++ b/configs/apalis_t30_defconfig
@@ -9,6 +9,8 @@
 # CONFIG_CMD_FPGA is not set
 # CONFIG_CMD_NFS is not set
 CONFIG_SPL_DM=y
+CONFIG_NETDEVICES=y
+CONFIG_E1000=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USE_PRIVATE_LIBGCC=y