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>

meson_options.txt

@@ -27,7 +27,7 @@ option('gstreamer',
 
 option('ipas',
         type : 'array',
-        choices : ['ipu3', 'raspberrypi', 'rkisp1', 'vimc'],
+        choices : ['ipu3', 'rkisp1', 'rpi/vc4', 'vimc'],
         description : 'Select which IPA modules to build')
 
 option('lc-compliance',
@@ -43,8 +43,8 @@ option('pipelines',
             'auto',
             'imx8-isi',
             'ipu3',
-            'raspberrypi',
             'rkisp1',
+            'rpi/vc4',
             'simple',
             'uvcvideo',
             'vimc'