mac80211: Allow IBSS mode and different beacon intervals

ath10k-ct supports the combination to select IBSS (ADHOC) mode and
different beacon intervals together. mac80211 does not like this
combination, but Ben says this is ok, so remove this check.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/mac80211/patches/subsys/400-allow-ibss-mixed.patch

@@ -0,0 +1,29 @@
+ath10k-ct starting with version 5.2 allows the combination of 
+NL80211_IFTYPE_ADHOC and beacon_int_min_gcd in ath10k_10x_ct_if_comb 
+which triggers this warning. Ben told me that this is not a big problem 
+and we should ignore this.
+
+--- a/net/wireless/core.c
++++ b/net/wireless/core.c
+@@ -613,21 +613,6 @@ static int wiphy_verify_combinations(str
+ 				    c->limits[j].max > 1))
+ 				return -EINVAL;
+ 
+-			/*
+-			 * This isn't well-defined right now. If you have an
+-			 * IBSS interface, then its beacon interval may change
+-			 * by joining other networks, and nothing prevents it
+-			 * from doing that.
+-			 * So technically we probably shouldn't even allow AP
+-			 * and IBSS in the same interface, but it seems that
+-			 * some drivers support that, possibly only with fixed
+-			 * beacon intervals for IBSS.
+-			 */
+-			if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
+-				    c->beacon_int_min_gcd)) {
+-				return -EINVAL;
+-			}
+-
+ 			cnt += c->limits[j].max;
+ 			/*
+ 			 * Don't advertise an unsupported type