on some platforms, erase suspend leads to data corruption and lockups when write
ops collide with erase ops. this has been observed on the buffalo wzr-hp-g300nh.
rather than play whack-a-mole with a hard to reproduce issue on a variety of devices,
simply disable erase suspend, as it will usually not produce any useful gain on
the small filesystems used on embedded hardware.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27984 3c298f89-4303-0410-b956-a3cf2f4a3e73
