libcamera: Standardise on C compatibility headers

Now that our usage of C compatibility header is documented, use them
consistently through the source code.

While at it, group the C and C++ include statements as defined in the
coding style, and fix a handful of #include ordering issues.

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

src/libcamera/stream.cpp

@@ -9,8 +9,8 @@
 
 #include <algorithm>
 #include <array>
-#include <climits>
 #include <iomanip>
+#include <limits.h>
 #include <sstream>
 
 #include <libcamera/request.h>