libcamera: Support draft controls and properties

Extend the control and property framework to support exposing draft
controls and properties in a scoped namespace.

The controls/properties themselves will retain the same ordering in the
relevant enum/id maps - but the access to any draft control will require
explicitly referencing through its' draft:: namespace prefix.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
[Added missing hunk in control_ids.cpp.in and changed subject]
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

include/libcamera/control_ids.h.in

@@ -26,6 +26,12 @@ ${controls}
 
 extern const ControlIdMap controls;
 
+namespace draft {
+
+${draft_controls}
+
+} /* namespace draft */
+
 } /* namespace controls */
 
 } /* namespace libcamera */

include/libcamera/property_ids.h.in

@@ -24,6 +24,12 @@ ${ids}
 
 ${controls}
 
+namespace draft {
+
+${draft_controls}
+
+} /* namespace draft */
+
 extern const ControlIdMap properties;
 
 } /* namespace properties */