i.MX8QXP has one SAI interface. Create a simple topology
without a codec for playback of 2 channels, 16bits samples
at 48Khz.
Host -> Buffer0 -> Volume -> Buffer1 -> SAI1
This is useful for testing various components like Dummy DMA,
EDMA and SAI drivers.
For more information about SAI you can read i.MX8QXP RM at:
https://www.nxp.com/docs/en/reference-manual/IMX8DQXPRM.pdf
Signed-off-by: Guido Roncarolo <guido.roncarolo@nxp.com>