libcamera: pipeline: rkisp1: Initialize IPA

The IPA init() call is a no-op in the current IPA, but it's part of the
IPA API and it should be called.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -386,6 +386,8 @@ int RkISP1CameraData::loadIPA()
 	ipa_->queueFrameAction.connect(this,
 				       &RkISP1CameraData::queueFrameAction);
 
+	ipa_->init();
+
 	return 0;
 }