libcamera: Split public and internal source arrays

Meson array variables hold lists of libcamera's source files. To help
facilitate the splitting of Doxygen generated documentation into
distinct public and internal versions, split those arrays to separate
public and internal variables.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Co-developed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/proxy/meson.build

@@ -15,5 +15,5 @@ foreach mojom : ipa_mojoms
                               './' + '@INPUT@'
                           ])
 
-    libcamera_sources += proxy
+    libcamera_internal_sources += proxy
 endforeach