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/ls1088ardb_qspi_defconfig b/configs/ls1088ardb_qspi_defconfig
index 452ee83..2459212 100644
--- a/configs/ls1088ardb_qspi_defconfig
+++ b/configs/ls1088ardb_qspi_defconfig
@@ -81,6 +81,8 @@
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_PHYLIB=y
 CONFIG_PHY_VITESSE=y
+CONFIG_FSL_MEMAC=y
+CONFIG_SYS_MEMAC_LITTLE_ENDIAN=y
 CONFIG_DM_ETH=y
 CONFIG_DM_MDIO=y
 CONFIG_PHY_GIGE=y