fix(dwc2): let DMA periodic channels halt naturally

DWC2 buffer/external DMA mode automatically halts a periodic channel at its next service boundary. Programming HCCHAR.CHDIS|CHENA for a non-split periodic channel is explicitly disallowed by the controller programming guide, yet channel_disable() skipped that write only for split periodic transfers.

Return without programming channel disable for every periodic DMA channel. Non-periodic DMA and slave-mode channels retain the existing explicit-disable path.

The previous path reproduced after 420 seconds in O2/DMA with a closing capture transfer left INVALID while HCCHAR retained CHENA|CHDIS and HCINT was clear.

0 files changed, 0 insertions, 0 deletions