Fill the `FrameMetadata` object of the `FrameBuffer`s because it should not be left uninitialized as users expect to be able to access it and find reasonable data there. Bug: https://bugs.libcamera.org/show_bug.cgi?id=245 Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>