dmaengine: Add support for reporting DMA cached data amount

A DMA hardware can have big cache or FIFO and the amount of data sitting in
the DMA fabric can be an interest for the clients.

For example in audio we want to know the delay in the data flow and in case
the DMA have significantly large FIFO/cache, it can affect the latenc/delay

Signed-off-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Tero Kristo <[email protected]>
Tested-by: Keerthy <[email protected]>
Reviewed-by: Grygorii Strashko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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