Add diversity option for prism2 cards

modules/admin-core/root/lib/uci/schema/default/wireless

@@ -79,6 +79,7 @@ config variable
 	option title 'Diversity (atheros)'
 	option datatype boolean
 	list depends type=atheros
+	list depends type=prism2
 
 config variable
 	option name 'txpower'

modules/admin-full/luasrc/model/cbi/admin_network/wifi.lua

@@ -122,6 +122,8 @@ end
 if hwtype == "prism2" then
 	s:option(Value, "txpower", translate("a_w_txpwr"), "att units").rmempty = true
 
+	s:option(Flag, "diversity", translate("wifi_diversity")).rmempty = false
+
 	s:option(Value, "txantenna", translate("wifi_txantenna")).optional = true
 	s:option(Value, "rxantenna", translate("wifi_rxantenna")).optional = true
 end