Don't always enable MTD mode unless MTD device is specified

On MTD devices, don't always enable MTD mode - the installer needs to
be able to access both the GPT disk and the MTD disk, so only
enable it if we install to /dev/fts

TEST=make runtests

Change-Id: I7688e6bc758ef47cfb9d468c1224ef43b2043d02
Reviewed-by: Randall Spangler <>
Commit-Queue: Albert Chaulk <>
Tested-by: Albert Chaulk <>
4 files changed