libcamera: v4l2_device: List valid controls at open

Enumerate all the valid controls a device supports at open() time.
A control is valid only if its type is supported.

Store the control information in a map inside the device to save
querying the control when setting or getting its value from the device
and provide an operation to retrieve information by control ID.

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

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