ipa: ipu3: Move ExposureTime to IPA

Now that we have the exposure time calculated, report it in the
controls::ExposureTime and don't use the pipeline handler for it
anymore.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/ipa/ipu3/ipu3.cpp

@@ -630,6 +630,8 @@ void IPAIPU3::parseStatistics(unsigned int frame,
 
 	ctrls.set(controls::ColourTemperature, context_.frameContext.awb.temperatureK);
 
+	ctrls.set(controls::ExposureTime, context_.frameContext.sensor.exposure * lineDuration_.get<std::micro>());
+
 	/*
 	 * \todo The Metadata provides a path to getting extended data
 	 * out to the application. Further data such as a simplifed Histogram