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api: dma: add api to retrieve runtime status
Some applications using DMA, such as UART RX, could need to complete the current DMA transaction earlier than predefined, based on other termination conditions, like UART's IDLE interrupts. In that case, the client needs to know how many data are still left in DMA transfer buffer so that it can figure out how many data has been transfered. However, the current DMA API doesn't provide any information for the client to learn the transfer buffer information. And some other information, like whether DMA transfer is busy or not, transfer direction, etc, could interest a client. So, added a dma API function to retrieve the current DMA runtime status. And implemented the API for STM32F4's DMA while keeping others unimplemented. Signed-off-by: Jun Li <firstname.lastname@example.org>
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