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/MPC8572DS_defconfig b/configs/MPC8572DS_defconfig
index 2821c8c..78e6205 100644
--- a/configs/MPC8572DS_defconfig
+++ b/configs/MPC8572DS_defconfig
@@ -18,6 +18,7 @@
 CONFIG_SYS_FSL_DDR2=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_PHYLIB=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
 CONFIG_SYS_NS16550=y