Migrate CONFIG_DRIVER_TI_CPSW to Kconfig

This converts CONFIG_DRIVER_TI_CPSW to Kconfig

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig
index 1e8a467..b94f053 100644
--- a/configs/am335x_evm_defconfig
+++ b/configs/am335x_evm_defconfig
@@ -39,8 +39,8 @@
 CONFIG_NAND=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_WINBOND=y
-CONFIG_PHYLIB=y
 CONFIG_DM_ETH=y
+CONFIG_DRIVER_TI_CPSW=y
 CONFIG_PHY_GIGE=y
 CONFIG_SYS_NS16550=y
 CONFIG_OMAP3_SPI=y