[rstmgr] module reset detection improvements

We should improve the reset detection scheme to be automatic.
Right now, the resets for each module is manually declared, and the user needs to make sure to pick both the reset with the right root and the right clock domain.

The second part can be error prone and has seen issues surfaced in a few places.

However, given that clocks / resets are always defined as a pair in module hjson, we should just ask the top level declaration to declare the root reset, and auto detect what the appropriate clock domain would be.

This would make the construction correct by design instead of requiring detailed user input.

In addition, since certain modules (ast) now need nested domain support, we should also account for this in the reset construction.
see #7980