MUSB: Real fix bug 4 usb bugs found on Blackfin

 - USB-IDE
   http://blackfin.uclinux.org/gf/project/linux-kernel/tracker/?action=TrackerItemEdit&tracker_item_id=3789
 - 30G iPod
   http://blackfin.uclinux.org/gf/project/linux-kernel/tracker/?action=TrackerItemEdit&tracker_item_id=3806
 - USB to CF/SD card reader
   http://blackfin.uclinux.org/gf/project/linux-kernel/tracker/?action=TrackerItemEdit&tracker_item_id=3790
   http://blackfin.uclinux.org/gf/project/linux-kernel/tracker/?action=TrackerItemEdit&tracker_item_id=3807

Sonic found, when we got STALL, we should clear the toggle.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>