Convert CONFIG_E1000 to Kconfig

This converts the following to Kconfig:
   CONFIG_E1000

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mvebu_mcbin-88f8040_defconfig b/configs/mvebu_mcbin-88f8040_defconfig
index 61cc260..2aa06f8 100644
--- a/configs/mvebu_mcbin-88f8040_defconfig
+++ b/configs/mvebu_mcbin-88f8040_defconfig
@@ -54,6 +54,7 @@
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_PHY_MARVELL=y
 CONFIG_PHY_GIGE=y
+CONFIG_E1000=y
 CONFIG_MVPP2=y
 CONFIG_NVME=y
 CONFIG_PCI=y