Introduce the CameraBuffer backend for the Chromium OS operating system
and the associated meson option.
The Chromium OS CameraBuffer implementation uses the
cros::CameraBufferManager class to perform mapping of 1 plane and multiplane
buffers and to retrieve size information.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>