libcamera: libipa: camera_sensor: Add IMX283 black level

Report the default sensor black level reported by the datasheet.

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

src/ipa/libipa/camera_sensor_helper.cpp

@@ -550,6 +550,8 @@ class CameraSensorHelperImx283 : public CameraSensorHelper
 public:
 	CameraSensorHelperImx283()
 	{
+		/* From datasheet: 0x32 at 10bits. */
+		blackLevel_ = 3200;
 		gainType_ = AnalogueGainLinear;
 		gainConstants_.linear = { 0, 2048, -1, 2048 };
 	}