wpanusb_bc: enhancement for beagleconnect freedom Rev C2 gateway
- get valid channels from device
- with the changes Sub-G(requires SubG PA patch) works without issues
- sometimes host sets an invalid channel(like channel 0) for 2.4G, getting valid channels from gateway device, ensures that this does not happen.
- change some of the non frequent DBG prints to INF.
- 2.4G fails at setting channel
depends on https://github.com/jadonk/wpanusb/pull/1