Revert "usb: dwc3: gadget: skip Set/Clear Halt when invalid"

This reverts commit ffb80fc6

.

Turns out that commit is wrong. Host controllers are allowed to use
Clear Feature HALT as means to sync data toggle between host and
periperal.

Cc: <stable@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>