libcamera: media_object: Add functions to entities

Media entities convey information about their main function in the
'function' field of 'struct media_v2_entity'.

Store the main function in the MediaEntity function_ class member and provide
a getter function for that.

While at there update comments, keep the MediaPad description in sync
with the MediaEntity one and remove a stale TODO entry.

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

0 files changed, 0 insertions, 0 deletions