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/rut_defconfig b/configs/rut_defconfig
index 27c14e1..fb4153c 100644
--- a/configs/rut_defconfig
+++ b/configs/rut_defconfig
@@ -62,6 +62,7 @@
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_MTD_UBI_FASTMAP=y
 CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT=1
+CONFIG_PHYLIB=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_USB_MUSB_HOST=y