libcamera: control_ids: Introduce LensShadingCorrectionEnable

Introduce a LensShadingCorrectionEnable control to enable and disable
LSC. This is useful to assess the working and quality of the lens
shading correction at runtime.

While at it drop the reference to the tuning file in the description of
the LensDewarpEnable control, as that information doesn't belong to the
controls.

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

src/libcamera/control_ids_core.yaml

@@ -1353,7 +1353,12 @@ controls:
       type: bool
       direction: inout
       description: |
-        Enable or disable lens dewarping. This control is only available if lens
-        dewarp parameters are configured in the tuning file.
+        Enable or disable lens dewarping.
+
+  - LensShadingCorrectionEnable:
+      type: bool
+      direction: inout
+      description: |
+        Enable or disable the lens shading correction.
 
 ...