Bring back USB write speed to SD card

This should have been fixed long ago but only bravo had gotten remedy.
http://review.cyanogenmod.org/#/c/8876/

see http://review.cyanogenmod.org/#/c/8875/ for details

Change-Id: I63c0910407f1eea789fb963f927344c54d1bea28
Merge remote-tracking branch 'cm/gingerbread' into gingerbread