libcamera: Make geometry.h a public header

Make the geometry header public so it can be used by the API facing
applications.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/v4l2_subdevice/list_formats.cpp

@@ -9,7 +9,8 @@
 #include <iostream>
 #include <vector>
 
-#include "geometry.h"
+#include <libcamera/geometry.h>
+
 #include "v4l2_subdevice.h"
 #include "v4l2_subdevice_test.h"