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/am43xx_evm_defconfig b/configs/am43xx_evm_defconfig
index 0cb79ea..802a8fb 100644
--- a/configs/am43xx_evm_defconfig
+++ b/configs/am43xx_evm_defconfig
@@ -35,7 +35,7 @@
 CONFIG_NAND=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_MACRONIX=y
-CONFIG_PHYLIB=y
+CONFIG_DRIVER_TI_CPSW=y
 CONFIG_PHY_GIGE=y
 CONFIG_DM_SERIAL=y
 CONFIG_SYS_NS16550=y