iwlwifi: dbg_ini: dump headers cleanup

Unite dump memory ranges under a single struct and add a specific header
for each type of memory.
Also, maintain a single version to all dump structures.

This cleanup is also needed for the future addition of FW notification
regions and others.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>