Parameters: Add support for volatile parameters

Volatile parameters are ones that do not represent a fundamental configuration change but rather than incrementally changing settings. These include logged flight hours or sensor offsets. Marking them as volatile avoids these parameters forcing time-consuming telemetry updates.

src/modules/systemlib/param/templates/px4_parameters.c.jinja

@@ -16,6 +16,11 @@ struct px4_parameters_t px4_parameters = {
 	{
 		"{{ param.attrib["name"] }}",
 		PARAM_TYPE_{{ param.attrib["type"] }},
+	{%- if param.attrib["volatile"] == "true" %}
+		.volatile_param = 1,
+	{%- else %}
+		.volatile_param = 0,
+	{%- endif %}
 	{%- if param.attrib["type"] == "FLOAT" %}
 		.val.f = {{ param.attrib["default"] }}
 	{%- elif param.attrib["type"] == "INT32" %}