defconfigs: disable exfat and ntfs

* fuse is used for these anyway, they're useless to be in-kernel

Change-Id: I14432f6a6fffe27c380b691cf2c35a39ae187732
exfat: don't turn on by default

Change-Id: I36ec727e3dc0a1ce97042f4e5b401f9aca7090d0