[DNM] testing hpsram power down code

[dcpleung]

Using https://github.com/zephyrproject-rtos/zephyr/pull/80333 to test HPSRAM powering down code.

[lgirdwood]

@dcpleung PR tests look ok, do you need @ssavati to schedule a more stressful test on a particular platform ?

[dcpleung]

@dcpleung PR tests look ok, do you need @ssavati to schedule a more stressful test on a particular platform ?

That would be great. This only needs to be tested on PTL.

[lgirdwood]

@ssavati I've assigned so we can track, i.e. when you have HW and time. Thanks !

[dcpleung]

We are going in the other direction so this is no longer needed.