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/xpedite550x_defconfig b/configs/xpedite550x_defconfig
index 63ce8b2..af56226 100644
--- a/configs/xpedite550x_defconfig
+++ b/configs/xpedite550x_defconfig
@@ -23,6 +23,7 @@
 # CONFIG_CMD_IRQ is not set
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_PHYLIB=y
 CONFIG_SYS_NS16550=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y