Improve CmsisPack memory region extraction.
Improve CmsisPack memory region extraction.

- Include 'Pname' in region filter.
- If the region has neither 'name' nor 'id' then use a string from the
  'start' and 'size' attributes as the name.

mbedmicro/pyOCD,pyocd/pyOCD,pyocd/pyOCD,flit/pyOCD,mesheven/pyOCD,mesheven/pyOCD,mbedmicro/pyOCD,mesheven/pyOCD,flit/pyOCD,mbedmicro/pyOCD