treewide: Migrate CONFIG_TSEC_ENET to Kconfig

Migrate the CONFIG_TSEC_ENET option to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/ids8313_defconfig b/configs/ids8313_defconfig
index 44b411c..481a3c7 100644
--- a/configs/ids8313_defconfig
+++ b/configs/ids8313_defconfig
@@ -39,7 +39,8 @@
 CONFIG_SYS_BOOTCOUNT_ADDR=0x9
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
-CONFIG_PHYLIB=y
+CONFIG_NETDEVICES=y
+CONFIG_TSEC_ENET=y
 # CONFIG_PCI is not set
 CONFIG_SYS_NS16550=y
 CONFIG_MPC8XXX_SPI=y