treewide: Move CONFIG_PHY_MARVELL to Kconfig

The CONFIG_PHY_MARVELL has already been migrated to Kconfig (some boards
already had it in their Kconfig), but had not been moved for older
boards.

Move it to the defconfigs for all boards.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/configs/MPC8349EMDS_defconfig b/configs/MPC8349EMDS_defconfig
index 5de1155..af2f30d 100644
--- a/configs/MPC8349EMDS_defconfig
+++ b/configs/MPC8349EMDS_defconfig
@@ -14,6 +14,7 @@
 CONFIG_CMD_DATE=y
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
+CONFIG_PHY_MARVELL=y
 CONFIG_NETDEVICES=y
 CONFIG_TSEC_ENET=y
 # CONFIG_PCI is not set