Move PHYLIB to Kconfig

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/zc5601_defconfig b/configs/zc5601_defconfig
index 8b7b4a9..501898a 100644
--- a/configs/zc5601_defconfig
+++ b/configs/zc5601_defconfig
@@ -27,4 +27,5 @@
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_PHYLIB=y
 CONFIG_OF_LIBFDT=y