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/BSC9132QDS_NAND_DDRCLK100_defconfig b/configs/BSC9132QDS_NAND_DDRCLK100_defconfig
index 066e6f7..0da87b3 100644
--- a/configs/BSC9132QDS_NAND_DDRCLK100_defconfig
+++ b/configs/BSC9132QDS_NAND_DDRCLK100_defconfig
@@ -4,3 +4,5 @@
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="BSC9132QDS,NAND,SYS_CLK_100_DDR_100"
 CONFIG_SPI_FLASH=y
+CONFIG_NETDEVICES=y
+CONFIG_E1000=y