dwc_otg: Declare DMA capability with HCD_DMA flag
Following [1], USB controllers have to declare DMA capabilities in order for them to be used by adding the HCD_DMA flag to their hc_driver struct. [1] 7b81cb6b ("usb: add a HCD_DMA flag instead of guestimating DMA capabilities") Signed-off-by:Phil Elwell <phil@raspberrypi.org>
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