ath9k: return survey data for all channels instead of just the current one

	struct ath_wiphy *aphy = hw->priv;

	struct ath_softc *sc = aphy->sc;

	struct ath_hw *ah = sc->sc_ah;

	struct ieee80211_conf *conf = &hw->conf;

	struct ieee80211_supported_band *sband;

	struct ath9k_channel *chan;

	sband = hw->wiphy->bands[IEEE80211_BAND_2GHZ];

	if (sband && idx >= sband->n_channels) {

		idx -= sband->n_channels;

		sband = NULL;

	}

	 if (idx != 0)

	if (!sband)

		sband = hw->wiphy->bands[IEEE80211_BAND_5GHZ];

	if (!sband || idx >= sband->n_channels)

	    return -ENOENT;

	survey->channel = conf->channel;

	survey->channel = &sband->channels[idx];

	chan = &ah->channels[survey->channel->hw_value];

	survey->filled = 0;

	if (ah->curchan && ah->curchan->noisefloor) {

	if (chan == ah->curchan)

		survey->filled |= SURVEY_INFO_IN_USE;

	if (chan->noisefloor) {

		survey->filled |= SURVEY_INFO_NOISE_DBM;

		survey->noise = ah->curchan->noisefloor;

		survey->noise = chan->noisefloor;

	}

	return 0;