IBSS vs. 802.11s

based on issue #670 (https://github.com/freifunk-berlin/firmware/issues/670)

Arch	board	WiFi-chip	IBSS	802.11s	"iw info" output
Ramips	GLInet MT300n	MT7620	no	yes	#{ managed, AP, mesh point } <= 8, total <= 8, #channels <= 1
	Unifi-ac-mesh	ath10k	no	yes	#{ AP, mesh point } <= 8, #{ managed } <= 1,
	Unifi-ac-mesh	ath10k-ct	yes	no	#{ managed, P2P-client } <= 16, #{ P2P-GO } <= 3, #{ AP } <= 16, #{ IBSS } <= 1

NOTE: This is how I understand it. Please correct me if I'm wrong

if (device AC-gen1)
  if (driver is from candela)
    adhoc is supported
    mesh is not supported
  else if (driver is the closed source version)
    mesh is supported
    adhoc is not supported
  fi
else if (device is AC-gen2)
  if (driver is from candela)
    mesh and adhoc are both supported
  else if (driver is the closed source version)
    mesh is supported
    adhoc is not supported
fi

---

Example: Unifi-ac-mesh with -ct firmware:

	valid interface combinations:
		 * #{ managed, P2P-client } <= 16, #{ P2P-GO } <= 3, #{ AP } <= 16, #{ IBSS } <= 1,

... with non-ct firmware

	valid interface combinations:
		 * #{ AP, mesh point } <= 8, #{ managed } <= 1,