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_SPIFLASH_DDRCLK133_defconfig b/configs/BSC9132QDS_SPIFLASH_DDRCLK133_defconfig
index 3cbe89b..7f3554d 100644
--- a/configs/BSC9132QDS_SPIFLASH_DDRCLK133_defconfig
+++ b/configs/BSC9132QDS_SPIFLASH_DDRCLK133_defconfig
@@ -3,3 +3,5 @@
 CONFIG_TARGET_BSC9132QDS=y
 CONFIG_SYS_EXTRA_OPTIONS="BSC9132QDS,SPIFLASH,SYS_CLK_100_DDR_133"
 CONFIG_SPI_FLASH=y
+CONFIG_NETDEVICES=y
+CONFIG_E1000=y