libcamera: geometry: Add missing ostream header in geometry.h

Commit c730dc7479 ("libcamera: geometry: Add operator<< for classes in
geometry") added usage of std::ostream in geometry.h but forget to
include the corresponding header. Fix it to avoid future compilation
breakages if indirect inclusions are changed.

Fixes: c730dc7479 ("libcamera: geometry: Add operator<< for classes in geometry")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

include/libcamera/geometry.h

@@ -8,6 +8,7 @@
 #pragma once
 
 #include <algorithm>
+#include <ostream>
 #include <string>
 
 #include <libcamera/base/compiler.h>