drivedb.h updates:

  - Seagate Medalist 1720                                      
  - SuperTalent UltraDrive GX SSD                              
  - Intel X25-M SSD                                            



git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@3071 4ea69e1a-61f1-4043-bf83-b5c94c648137