nl80211: add "band" to iwinfo_freqlist_entry

So that consumers don't have to fiddle around with mapping frequencies
to bands, which everyone seems to do a little differently.

Note: This changes the ABI.

Signed-off-by: Andre Heider <a.heider@gmail.com>

include/iwinfo.h

@@ -271,6 +271,7 @@ struct iwinfo_txpwrlist_entry {
 };
 
 struct iwinfo_freqlist_entry {
+	uint8_t band;
 	uint8_t channel;
 	uint32_t mhz;
 	uint8_t restricted;

iwinfo_nl80211.c

@@ -3009,6 +3009,7 @@ static int nl80211_get_freqlist_cb(struct nl_msg *msg, void *arg)
 					    freqs[NL80211_FREQUENCY_ATTR_DISABLED])
 						continue;
 
+					e->band = nl80211_get_band(band->nla_type);
 					e->mhz = nla_get_u32(freqs[NL80211_FREQUENCY_ATTR_FREQ]);
 					e->channel = nl80211_freq2channel(e->mhz);