ipa: rkisp1: Move ov4689 and ov5640 black levels into sensor helpers

Move black levels for tuning files that contained a BLC block into
the camera sensor helpers.

ov4689.yaml had 66@12bit while the datasheet states 64@12bit. Use the
value from the datasheet (scaled to 16bit).

ov5640.yaml had 256@12bit while the datasheet states 16@10bit. Looking
at the commit message the 256 most likely stems from the imx219 tuning
file and 16@10bit is the same as the 64@12bit from the ov4689. This
seems more likely and is therefore used.

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/ipa/libipa/camera_sensor_helper.cpp

@@ -553,6 +553,8 @@ class CameraSensorHelperOv4689 : public CameraSensorHelper
 public:
 	CameraSensorHelperOv4689()
 	{
+		/* From datasheet: 0x40 at 12bits. */
+		blackLevel_ = 1024;
 		gainType_ = AnalogueGainLinear;
 		gainConstants_.linear = { 1, 0, 0, 128 };
 	}
@@ -564,6 +566,8 @@ class CameraSensorHelperOv5640 : public CameraSensorHelper
 public:
 	CameraSensorHelperOv5640()
 	{
+		/* From datasheet: 0x10 at 10bits. */
+		blackLevel_ = 1024;
 		gainType_ = AnalogueGainLinear;
 		gainConstants_.linear = { 1, 0, 0, 16 };
 	}

src/ipa/rkisp1/data/ov4689.yaml

@@ -6,8 +6,4 @@ algorithms:
   - Agc:
   - Awb:
   - BlackLevelCorrection:
-      R:  66
-      Gr: 66
-      Gb: 66
-      B:  66
 ...

src/ipa/rkisp1/data/ov5640.yaml

@@ -6,10 +6,6 @@ algorithms:
   - Agc:
   - Awb:
   - BlackLevelCorrection:
-      R:  256
-      Gr: 256
-      Gb: 256
-      B:  256
   - ColorProcessing:
   - GammaSensorLinearization:
       x-intervals: [ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 ]