ral: switch to ieee80211_add_channel_list_*()

• 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.

Differential Revision: https://reviews.freebsd.org/D6182