libcamera: Include header related to source file first

Include the header file corresponding to the source file in the very
first position. This complies with the Google C++ coding style
guideliens, and helps ensuring that the headers are self-contained.

Three bugs are already caught by this change (missing includes or
forward declarations) in device_enumerator.h, event_dispatcher_poll.h
and pipeline_handler.h. Fix them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/geometry.cpp

@@ -5,11 +5,11 @@
  * geometry.cpp - Geometry-related structures
  */
 
+#include <libcamera/geometry.h>
+
 #include <sstream>
 #include <stdint.h>
 
-#include <libcamera/geometry.h>
-
 /**
  * \file geometry.h
  * \brief Data structures related to geometric objects