libcamera: Move file_descriptor.h to base/

The FileDescriptor class is a generic helper that matches the criteria
for the base library. Move it there.

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

src/libcamera/pipeline/raspberrypi/dma_heaps.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <libcamera/file_descriptor.h>
+#include <libcamera/base/file_descriptor.h>
 
 namespace libcamera {
 

src/libcamera/pipeline/raspberrypi/raspberrypi.cpp

@@ -13,9 +13,10 @@
 #include <queue>
 #include <unordered_set>
 
+#include <libcamera/base/file_descriptor.h>
+
 #include <libcamera/camera.h>
 #include <libcamera/control_ids.h>
-#include <libcamera/file_descriptor.h>
 #include <libcamera/formats.h>
 #include <libcamera/ipa/raspberrypi.h>
 #include <libcamera/ipa/raspberrypi_ipa_interface.h>