libcamera: camera: Provide a list of ControlInfo

Extend the Camera class to expose the controls it supports. Each
pipeline should generate a list of controls supported by each camera it
creates. These are represented by a ControlInfoMap, and an associated
ControlList of default values.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/controls.cpp

@@ -325,6 +325,11 @@ bool operator==(const ControlInfo &lhs, const ControlId &rhs)
 	return lhs.id() == rhs;
 }
 
+/**
+ * \typedef ControlInfoMap
+ * \brief A map of ControlId to ControlInfo
+ */
+
 /**
  * \class ControlList
  * \brief Associate a list of ControlId with their values for a camera