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/MPC8555CDS_defconfig b/configs/MPC8555CDS_defconfig
index 8410fa4..cb37d9a 100644
--- a/configs/MPC8555CDS_defconfig
+++ b/configs/MPC8555CDS_defconfig
@@ -13,5 +13,6 @@
 # CONFIG_CMD_HASH is not set
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_PHYLIB=y
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y