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/mx6cuboxi_defconfig b/configs/mx6cuboxi_defconfig
index f0b6679..766a12c 100644
--- a/configs/mx6cuboxi_defconfig
+++ b/configs/mx6cuboxi_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_EXT4_WRITE=y
 # CONFIG_SPL_PARTITION_UUIDS is not set
 CONFIG_DM=y
+CONFIG_PHYLIB=y
 CONFIG_DM_THERMAL=y
 CONFIG_USB=y
 CONFIG_USB_STORAGE=y