This adds skeleton support for the audio DSP hardware found on
NXP i.MX8ULP platform.

On i.MX8ULP resources (clocks, power, etc) are managed by the
System Integration Module in LPAV domain and XRDC which is handled
by arm trusted firmware.
Signed-off-by: Zhang Peng <peng.zhang_8@nxp.com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/1660787634-28550-2-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>