libcamera: controls: Generate macro for each control

Generate a macro in the form of LIBCAMERA_HAS_$VENDOR_VENDOR_$MODE_$NAME
for each control so that its existence can be checked easily and without
extra version checks.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/control_ids.h.in

@@ -49,6 +49,7 @@ extern const std::array<const ControlValue, {{ctrl.enum_values_count}}> {{ctrl.n
 extern const std::map<std::string, {{ctrl.type}}> {{ctrl.name}}NameValueMap;
 {% endif -%}
 extern const Control<{{ctrl.type}}> {{ctrl.name}};
+#define LIBCAMERA_HAS_{{vendor|upper}}_VENDOR_{{mode|upper}}_{{ctrl.name|snake_case|upper}}
 {% endfor -%}
 
 {% if vendor != 'libcamera' %}