ral: switch to ieee80211_add_channel_list_*()

[avos]

Summary

• Use device's channel list instead of default one (from ieee80211_init_channels()).
• Add ic_getradiocaps() method.

Added channels:
2GHz (all): 12, 13, 14.
5GHz:

• rt2661: 165
• rt2860: 38, 46, 54, 62, 102, 110, 118, 126, 134, 151, 159, 165, 167, 169, 171, 173.

Test Plan

Needs testing (ifconfig wlan0 create wlandev ral0 regdomain NONE && ifconfig -v wlan0 list chan; should give 1-13 2GHz channels at least);