libcamera/base: Move event_notifier to base

Move the event notifier, and associated header updates.

Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
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/process.cpp

@@ -20,11 +20,10 @@
 #include <unistd.h>
 #include <vector>
 
+#include <libcamera/base/event_notifier.h>
 #include <libcamera/base/log.h>
 #include <libcamera/base/utils.h>
 
-#include "libcamera/internal/event_notifier.h"
-
 /**
  * \file process.h
  * \brief Process object