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/xpedite520x_defconfig b/configs/xpedite520x_defconfig
index 0a705f8..003a8e9 100644
--- a/configs/xpedite520x_defconfig
+++ b/configs/xpedite520x_defconfig
@@ -23,5 +23,6 @@
 # CONFIG_CMD_IRQ is not set
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_PHYLIB=y
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y