Clean up scanning functions and printouts

The is_scanning state is no longer needed and was an unfortunate
leftover from earlier.

The scanning works well enough to not have it using info prints any
more.

Signed-off-by: Olof Johansson <dev@skyshaper.net>
Clarify error message when loading mac addresses

Currently the mac address printout is wrong since it says it can't
readd MAC_ADDR0 for mac addresses where it doesn't even try to do
this.

Use this message only for addr[0] and another for the ones where we
use locally assigned addresses.

Signed-off-by: Olof Johansson <dev@skyshaper.net>
Use Airgo OUI on randomized fallback address

Use the Airgo oui instead of old Qcom oui for the randomized fallback
address.

Signed-off-by: Olof Johansson <dev@skyshaper.net>
Remove _req from wcn36xx_smd_switch_channel function

Fix naming of wcn36xx_smd_switch_channel function. It included a
suffex with _req which is not in line with our function naming.