intel_adsp: move memory windows to DTS proper

Instead of just declaring the memory window register in DTS and have
everything else all over the place (headers, Kconfig, etc.) this change
defines the memory window instances in DTS and uses the device model to
initialize the windows. Code is still part of the SoC, given that we do
not have a driver subsystem suitable for this type of device yet.

Move FW status to own workflow and separate from window setup.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>