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/smartweb_defconfig b/configs/smartweb_defconfig
index dd83b75..1db2acc 100644
--- a/configs/smartweb_defconfig
+++ b/configs/smartweb_defconfig
@@ -41,6 +41,7 @@
 CONFIG_CLK_AT91=y
 CONFIG_DFU_NAND=y
 # CONFIG_MMC is not set
+CONFIG_PHYLIB=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_GADGET=y