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/ls2080ardb_defconfig b/configs/ls2080ardb_defconfig
index 82ad9b2..ec6869c 100644
--- a/configs/ls2080ardb_defconfig
+++ b/configs/ls2080ardb_defconfig
@@ -83,6 +83,8 @@
 CONFIG_PHY_AQUANTIA=y
 CONFIG_PHY_CORTINA=y
 CONFIG_CORTINA_FW_ADDR=0x580980000
+CONFIG_FSL_MEMAC=y
+CONFIG_SYS_MEMAC_LITTLE_ENDIAN=y
 CONFIG_E1000=y
 CONFIG_MII=y
 CONFIG_NVME_PCI=y