Add 5GHz support

Provides the necessary registrations for mac80211 to recognize 5Ghz
support.

Signed-off-by: Olof Johansson <dev@skyshaper.net>
Simplify scanning and use correct receive channel

This simplifies the scanning a bit by removing the end_scan which is
not necessary. It also makes use of the channel switch command instead
of using start scan on every channel.

Reorders the 2.4Ghz channels to that the hw_values are correct
and possible to use.

Signed-off-by: Olof Johansson <dev@skyshaper.net>
Merge pull request #23 from Coi-l/pr

5GHz support and simplified scanning