libcamera: camera: Rename name() to id()

Rename Camera::name() to camera::id() to better describe what it
represents, a unique and stable ID for the camera. While at it improve
the documentation for the camera ID to describe it needs to be stable
for a camera between resets of the system.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/camera_controls.cpp

@@ -36,7 +36,7 @@ CameraControlValidator::CameraControlValidator(Camera *camera)
 
 const std::string &CameraControlValidator::name() const
 {
-	return camera_->name();
+	return camera_->id();
 }
 
 /**