libcamera: camera_sensor_properties: Add ov7251 and ov9281

Add entries for the OmniVision OV7251 and OV9281 sensors. The control
delay values are drawn from the Raspberry Pi CameraSensorHelper class
for these sensors - the pixel sizes from the datasheets. Both sensors
are monochrome and do not have test pattern settings that correspond
to defined control values.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/sensor/camera_sensor_properties.cpp

@@ -386,6 +386,16 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
 				.hblankDelay = 2
 			},
 		} },
+		{ "ov7251", {
+			.unitCellSize = { 3000, 3000 },
+			.testPatternModes =  { },
+			.sensorDelays = {
+				.exposureDelay = 2,
+				.gainDelay = 2,
+				.vblankDelay = 2,
+				.hblankDelay = 2
+			},
+		} },
 		{ "ov8858", {
 			.unitCellSize = { 1120, 1120 },
 			.testPatternModes = {
@@ -415,6 +425,16 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
 			},
 			.sensorDelays = { },
 		} },
+		{ "ov9281", {
+			.unitCellSize = { 3000, 3000 },
+			.testPatternModes =  { },
+			.sensorDelays = {
+				.exposureDelay = 2,
+				.gainDelay = 2,
+				.vblankDelay = 2,
+				.hblankDelay = 2
+			},
+		} },
 		{ "ov13858", {
 			.unitCellSize = { 1120, 1120 },
 			.testPatternModes =  {