libcamera/base: Move span to base library

Move span, and adjust the Doxygen exclusion as well.

Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/ipa_module.cpp

@@ -21,10 +21,9 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#include <libcamera/span.h>
-
 #include <libcamera/base/file.h>
 #include <libcamera/base/log.h>
+#include <libcamera/base/span.h>
 #include <libcamera/base/utils.h>
 
 #include "libcamera/internal/pipeline_handler.h"