pipeline: ipa: raspberrypi: Refactor and move the Raspberry Pi code

Split the Raspberry Pi pipeline handler and IPA source code into common
and VC4/BCM2835 specific file structures.

For the pipeline handler, the common code files now live in
src/libcamera/pipeline/rpi/common/
and the VC4-specific files in src/libcamera/pipeline/rpi/vc4/.

For the IPA, the common code files now live in
src/ipa/rpi/{cam_helper,controller}/
and the vc4 specific files in src/ipa/rpi/vc4/. With this change, the
camera tuning files are now installed under share/libcamera/ipa/rpi/vc4/.

To build the pipeline and IPA, the meson configuration options have now
changed from "raspberrypi" to "rpi/vc4":

meson setup build -Dipas=rpi/vc4 -Dpipelines=rpi/vc4

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/rpi/controller/device_status.cpp

@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2021, Raspberry Pi Ltd
+ *
+ * device_status.cpp - device (image sensor) status
+ */
+#include "device_status.h"
+
+using namespace libcamera; /* for the Duration operator<< overload */
+
+std::ostream &operator<<(std::ostream &out, const DeviceStatus &d)
+{
+	out << "Exposure: " << d.shutterSpeed
+	    << " Frame length: " << d.frameLength
+	    << " Line length: " << d.lineLength
+	    << " Gain: " << d.analogueGain;
+
+	if (d.aperture)
+		out << " Aperture: " << *d.aperture;
+
+	if (d.lensPosition)
+		out << " Lens: " << *d.lensPosition;
+
+	if (d.flashIntensity)
+		out << " Flash: " << *d.flashIntensity;
+
+	if (d.sensorTemperature)
+		out << " Temperature: " << *d.sensorTemperature;
+
+	return out;
+}