dmaengine: imx-sdma: support dual fifo for DEV_TO_DEV

SSI and SPDIF are dual fifo interface, when support ASRC P2P
with SSI and SPDIF, the src fifo or dst fifo number can be
two.

The p2p watermark level bit 13 and 14 are designed for
these use case. This patch is to complete this function
in driver.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Joy Zou <joy.zou@nxp.com>
Acked-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240329-sdma_upstream-v4-3-daeb3067dea7@nxp.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>