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/am335x_sl50_defconfig b/configs/am335x_sl50_defconfig
index 5d5c68e..41dd2da 100644
--- a/configs/am335x_sl50_defconfig
+++ b/configs/am335x_sl50_defconfig
@@ -40,6 +40,7 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_MMC_OMAP_HS=y
+CONFIG_PHYLIB=y
 CONFIG_SYS_NS16550=y
 CONFIG_FAT_WRITE=y
 CONFIG_LZO=y