Convert CONFIG_FSL_MEMAC et al to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_MEMAC
   CONFIG_SYS_MEMAC_LITTLE_ENDIAN

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ten64_tfa_defconfig b/configs/ten64_tfa_defconfig
index 4bbee30..dad6c2d 100644
--- a/configs/ten64_tfa_defconfig
+++ b/configs/ten64_tfa_defconfig
@@ -71,6 +71,7 @@
 CONFIG_SPI_FLASH_MTD=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_VITESSE=y
+CONFIG_SYS_MEMAC_LITTLE_ENDIAN=y
 CONFIG_DM_ETH=y
 CONFIG_DM_MDIO=y
 CONFIG_E1000=y