libcamera/base: Move File to base library

The File abstraction is a base helper and not part of the libcamera
API. Move it to to allow usage by users of the base library.

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/ipa/vimc/vimc.cpp

@@ -4,7 +4,6 @@
  *
  * ipa_vimc.cpp - Vimc Image Processing Algorithm module
  */
-
 #include <libcamera/ipa/vimc_ipa_interface.h>
 
 #include <fcntl.h>
@@ -14,13 +13,12 @@
 
 #include <iostream>
 
+#include <libcamera/base/file.h>
 #include <libcamera/base/log.h>
 
 #include <libcamera/ipa/ipa_interface.h>
 #include <libcamera/ipa/ipa_module_info.h>
 
-#include "libcamera/internal/file.h"
-
 namespace libcamera {
 
 LOG_DEFINE_CATEGORY(IPAVimc)