This adds initial support for NXP SDMA controller. We make use
of NXP HAL to configure the IP.
SDMA uses BD (buffer descriptors) to describe a transfer. We create
a cyclic list of descriptors and trigger them manually at start and
later when data is available.
This is tested using Sound Open Firmware app on top of Zephyr.
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
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