base-files: add support for the new ar8xxx MIB counters settings

Commit "generic: ar8216: add mib_poll_interval switch attribute" has
added mib_poll_interval global config option and commit "generic:
ar8216: group MIB counters and use two basic ones only by default" has
added mib_type config option.

So this patch adds ucidef_set_ar8xxx_switch_mib helper function which
would allow configuration of the above mentioned new switch config
options.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/base-files/files/lib/functions/uci-defaults.sh

@@ -182,6 +182,19 @@ _ucidef_finish_switch_roles() {
 	done
 }
 
+ucidef_set_ar8xxx_switch_mib() {
+	local name="$1"
+	local type="$2"
+	local interval="$3"
+
+	json_select_object switch
+		json_select_object "$name"
+			json_add_int ar8xxx_mib_type $type
+			json_add_int ar8xxx_mib_poll_interval $interval
+		json_select ..
+	json_select ..
+}
+
 ucidef_add_switch() {
 	local name="$1"; shift
 	local port num role device index need_tag prev_role