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/framebuffer_allocator.cpp

@@ -95,7 +95,7 @@ int FrameBufferAllocator::allocate(Stream *stream)
 	int ret = camera_->exportFrameBuffers(stream, &buffers_[stream]);
 	if (ret == -EINVAL)
 		LOG(Allocator, Error)
-			<< "Stream is not part of " << camera_->name()
+			<< "Stream is not part of " << camera_->id()
 			<< " active configuration";
 	return ret;
 }