- correction of previous mod http://www.multiwii.com/forum/viewtopic.php?f=8&t=3635&start=10#p43916
- we keep only 8/16/32 kHz

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1639 02679b44-d973-9852-f2fa-63770883b36c