libcamera: v4l2_controls: Remove V4L2ControlInfo::size()

We don't support V4L2 compound controls, the size field is thus unused.
Remove it to ease merging of the libcamera and V4L2 control info
classes. Support for array controls can then be added later on top, and
would be useful for libcamera controls too.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/v4l2_controls.cpp

@@ -127,8 +127,6 @@ V4L2ControlId::V4L2ControlId(const struct v4l2_query_ext_ctrl &ctrl)
 V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl)
 	: id_(ctrl)
 {
-	size_ = ctrl.elem_size * ctrl.elems;
-
 	if (ctrl.type == V4L2_CTRL_TYPE_INTEGER64)
 		range_ = ControlRange(static_cast<int64_t>(ctrl.minimum),
 				      static_cast<int64_t>(ctrl.maximum));
@@ -143,12 +141,6 @@ V4L2ControlInfo::V4L2ControlInfo(const struct v4l2_query_ext_ctrl &ctrl)
  * \return The V4L2 control ID
  */
 
-/**
- * \fn V4L2ControlInfo::size()
- * \brief Retrieve the control value data size (in bytes)
- * \return The V4L2 control value data size
- */
-
 /**
  * \fn V4L2ControlInfo::range()
  * \brief Retrieve the control value range