mbedos-release-15-11: Change version number to 2.2.0

Changed for library and yotta module
  1. 37ff140 Change main license to Apache 2.0 by Manuel Pégourié-Gonnard · 10 years ago
  2. 99ed678 - Changed line endings and encodings to unix and utf-8 by Paul Bakker · 15 years ago
  3. 053a8b1 - Added default GPL license file by Paul Bakker · 15 years ago