pipeline: ipa: raspberrypi: Handle failures during IPA configuration

If the IPA fails during configuration, return an error flag to the
pipeline handler and fail the use case gracefully.

At present, the IPA configuration can fail for the following reasons:
- The sensor is not recognised, and fails to open a CamHelper object.
- The pipeline handler did not pass in controls for the ISP and sensor.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/ipa/raspberrypi.h

@@ -21,6 +21,7 @@ enum ConfigParameters {
 	IPA_CONFIG_STAGGERED_WRITE = (1 << 1),
 	IPA_CONFIG_SENSOR = (1 << 2),
 	IPA_CONFIG_DROP_FRAMES = (1 << 3),
+	IPA_CONFIG_FAILED = (1 << 4),
 };
 
 enum Operations {