usb: dwc3: gadget: add trb enqueue/dequeue helpers

Add three little helpers which will aid in making
the code slightly easier to read. One helper
increments enqueue pointer, another increments
dequeue pointer and the last one tests if we're
dealing with the last TRB.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
1 file changed