cfg80211: add helper functions for start/end freq
cfg80211: add helper functions for start/end freq

Add helper fuctions for start/end freq.

Signed-off-by: Janusz Dziedzic <a4201e08a607951e17dcd5a575c0fe6bceb34e87@tieto.com>
Reviewed-by: Luis R. Rodriguez <d4fa18192c5a479e564d29c2300c2e15afd1d8d7@do-not-panic.com>
Signed-off-by: Johannes Berg <bff32994ff0f8d048f262a8388145a71b6071bfe@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs