soc: intel_adsp: tools: merge cavstool.py and acetool.py code

Merge codebases of cavstool.py and acetool.py as the two have
a lot of duplicated code.

To ease with transition, keep acetool.py around with implementation
imported from cavstool.py. This will help to keep any automated
testing flows working that assume both tools exist.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>