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/gurnard_defconfig b/configs/gurnard_defconfig
index c32c4a8..e8d1a84 100644
--- a/configs/gurnard_defconfig
+++ b/configs/gurnard_defconfig
@@ -22,6 +22,7 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
+CONFIG_PHYLIB=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_STORAGE=y