k3dma: Fix memory handling in preparation for cyclic mode

With cyclic mode, the shared virt-dma logic doesn't actually
manage the descriptor state, nor the calling of the descriptor
free callback. This results in leaking a desc structure every
time we start an audio transfer.

Thus we must manage it ourselves. The k3dma driver already keeps
track of the active and finished descriptors via ds_run and ds_done
pointers, so cleanup how we handle those two values, so when we
tear down everything in terminate_all, call free_desc on the ds_run
and ds_done pointers if they are not null.

NOTE: HiKey doesn't use the non-cyclic dma modes, so I'm not been
able to test those modes. But with this patch we no longer leak
the desc structures.

Cc: Zhangfei Gao <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Vinod Koul <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Andy Green <[email protected]>
Acked-by: Zhangfei Gao <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

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